diff --git a/docz/docs/03-demos/02-frontend/05-svelte.md b/docz/docs/03-demos/02-frontend/05-svelte.md
index f5bd106..e59dbd8 100644
--- a/docz/docs/03-demos/02-frontend/05-svelte.md
+++ b/docz/docs/03-demos/02-frontend/05-svelte.md
@@ -25,7 +25,7 @@ models and data flow strategies.
 This demo focuses on Svelte concepts. Other demos cover general deployments:
 
 - [Static Site Generation powered by SvelteKit](/docs/demos/static/svelte)
-- [iOS applications powered by CapacitorJS](/docs/demos/mobile/capacitor)
+- [iOS and Android applications powered by CapacitorJS](/docs/demos/mobile/capacitor)
 - [Desktop application powered by Wails](/docs/demos/desktop/wails)
 
 :::
diff --git a/docz/docs/03-demos/17-mobile/01-reactnative.md b/docz/docs/03-demos/17-mobile/01-reactnative.md
index c8aa3b9..130f631 100644
--- a/docz/docs/03-demos/17-mobile/01-reactnative.md
+++ b/docz/docs/03-demos/17-mobile/01-reactnative.md
@@ -222,6 +222,13 @@ const wb = XLSX.read(ab);
 
 This demo was tested in the following environments:
 
+**Real Devices**
+
+| OS         | Device            | RN       | Date       |
+|:-----------|:------------------|:---------|:-----------|
+| iOS 15.1   | iPhone 12 Pro Max | `0.73.6` | 2024-03-13 |
+| Android 29 | NVIDIA Shield     | `0.73.6` | 2024-03-13 |
+
 **Simulators**
 
 | OS         | Device            | RN       | Dev Platform | Date       |
@@ -231,13 +238,6 @@ This demo was tested in the following environments:
 | Android 34 | Pixel 3a          | `0.73.5` | `win10-x64`  | 2024-03-05 |
 | Android 34 | Pixel 3a          | `0.73.7` | `linux-x64`  | 2024-04-29 |
 
-**Real Devices**
-
-| OS         | Device            | RN       | Date       |
-|:-----------|:------------------|:---------|:-----------|
-| iOS 15.1   | iPhone 12 Pro Max | `0.73.6` | 2024-03-13 |
-| Android 29 | NVIDIA Shield     | `0.73.6` | 2024-03-13 |
-
 :::
 
 0) Install React Native dependencies
@@ -1004,6 +1004,13 @@ try {
 
 This demo was tested in the following environments:
 
+**Real Devices**
+
+| OS         | Device            | RN       | Date       |
+|:-----------|:------------------|:---------|:-----------|
+| iOS 15.5   | iPhone 13 Pro Max | `0.73.6` | 2024-03-31 |
+| Android 29 | NVIDIA Shield     | `0.73.6` | 2024-03-31 |
+
 **Simulators**
 
 | OS         | Device            | RN       | Dev Platform | Date       |
@@ -1013,13 +1020,6 @@ This demo was tested in the following environments:
 | Android 34 | Pixel 3a          | `0.73.6` | `win10-x64`  | 2024-03-31 |
 | Android 34 | Pixel 3a          | `0.73.6` | `linux-x64`  | 2024-03-31 |
 
-**Real Devices**
-
-| OS         | Device            | RN       | Date       |
-|:-----------|:------------------|:---------|:-----------|
-| iOS 15.5   | iPhone 13 Pro Max | `0.73.6` | 2024-03-31 |
-| Android 29 | NVIDIA Shield     | `0.73.6` | 2024-03-31 |
-
 :::
 
 :::danger pass
diff --git a/docz/docs/03-demos/17-mobile/02-nativescript.md b/docz/docs/03-demos/17-mobile/02-nativescript.md
index 83831f7..a4e40ee 100644
--- a/docz/docs/03-demos/17-mobile/02-nativescript.md
+++ b/docz/docs/03-demos/17-mobile/02-nativescript.md
@@ -52,6 +52,13 @@ Angular and TypeScript is assumed.
 
 This demo was tested in the following environments:
 
+**Real Devices**
+
+| OS         | Device              | NS       | Date       |
+|:-----------|:--------------------|:---------|:-----------|
+| Android 30 | NVIDIA Shield       | `8.6.5`  | 2024-04-07 |
+| iOS 15.1   | iPad Pro            | `8.6.1`  | 2023-12-04 |
+
 **Simulators**
 
 | OS         | Device              | NS       | Dev Platform | Date       |
@@ -60,13 +67,6 @@ This demo was tested in the following environments:
 | iOS 17.0.1 | iPhone SE (3rd gen) | `8.6.1`  | `darwin-x64` | 2023-12-04 |
 | Android 34 | Pixel 3a            | `8.6.5`  | `win10-x64`  | 2024-04-07 |
 
-**Real Devices**
-
-| OS         | Device              | NS       | Date       |
-|:-----------|:--------------------|:---------|:-----------|
-| Android 30 | NVIDIA Shield       | `8.6.5`  | 2024-04-07 |
-| iOS 15.1   | iPad Pro            | `8.6.1`  | 2023-12-04 |
-
 :::
 
 :::danger Telemetry
diff --git a/docz/docs/03-demos/17-mobile/04-ionic.md b/docz/docs/03-demos/17-mobile/04-ionic.md
index 533f5cf..9b24977 100644
--- a/docz/docs/03-demos/17-mobile/04-ionic.md
+++ b/docz/docs/03-demos/17-mobile/04-ionic.md
@@ -49,12 +49,21 @@ The [CapacitorJS demo](/docs/demos/mobile/capacitor) covers CapacitorJS apps.
 
 This demo was tested in the following environments:
 
-**Simulators**
+**Real Devices**
 
 | OS         | Device              | Config | Date       |
 |:-----------|:--------------------|:-------|:-----------|
-| Android 34 | Pixel 3a            | A      | 2023-12-04 |
-| iOS 17.0.1 | iPhone SE (3rd gen) | A      | 2023-12-04 |
+| Android 30 | NVIDIA Shield       | B      | 2024-05-30 |
+| iOS 15.1   | iPad Pro            | B      | 2024-05-30 |
+
+**Simulators**
+
+| OS         | Device              | Config | Dev Platform | Date       |
+|:-----------|:--------------------|:-------|:-------------|:-----------|
+| Android 34 | Pixel 3a            | A      | `darwin-x64` | 2023-12-04 |
+| iOS 17.0.1 | iPhone SE (3rd gen) | A      | `darwin-x64` | 2023-12-04 |
+| Android 34 | Pixel 3a            | B      | `darwin-arm` | 2024-05-30 |
+| iOS 17.5   | iPhone SE (3rd gen) | B      | `darwin-arm` | 2024-05-30 |
 
 <details>
   <summary><b>Configurations</b> (click to show)</summary>
@@ -65,6 +74,12 @@ Configuration A:
 - Cordova: `cordova-lib@12.0.1`, `android 12.0.1, ios 7.0.1`
 - File Integration: `@awesome-cordova-plugins/file` version `6.4.0`
 
+Configuration B:
+
+- Ionic: `@ionic/angular 8.2.0`, `@ionic/angular-toolkit 11.0.1`
+- Cordova: `cordova-lib@12.0.1`, `android 13.0.0, ios 7.1.0`
+- File Integration: `@awesome-cordova-plugins/file` version `6.7.0`
+
 </details>
 
 :::
@@ -138,7 +153,18 @@ simplifies iteration over the array of arrays:
 
 ### File Operations
 
-`@awesome-cordova-plugins/file` reads and writes files on devices.
+The `cordova-plugin-file` plugin reads and writes files on devices.
+
+:::caution pass
+
+For Android 30+, due to scoped storage rules, the standard file module writes
+private files that cannot be accessed from the Files app.
+
+A Storage Access Framework plugin must be used to write external files.
+
+:::
+
+`@awesome-cordova-plugins/file` is a wrapper designed for Ionic + Angular apps.
 
 :::info pass
 
@@ -217,12 +243,29 @@ known location. After writing, an alert will display the location of the file.
 
 1) Follow the official instructions for iOS and Android development[^9].
 
+<details>
+  <summary><b>Installation Notes</b> (click to show)</summary>
+
+Ionic requires Java 17.
+
+</details>
+
 2) Install required global dependencies:
 
 ```bash
 npm i -g cordova cordova-res @angular/cli native-run @ionic/cli
 ```
 
+:::note pass
+
+In some systems, the command must be run as the root user:
+
+```bash
+sudo npm i -g cordova cordova-res @angular/cli native-run @ionic/cli
+```
+
+:::
+
 ### Base Project
 
 3) Create a new project:
@@ -239,9 +282,9 @@ If a prompt asks about creating an Ionic account, enter `N` to opt out.
 
 :::caution pass
 
-Due to conflicts in the dependency tree, the command failed in the last test.
+Due to conflicts in the dependency tree, the command failed in some test runs.
 
-The fix is to force install all modules:
+If the package installation fails, forcefully install all modules:
 
 ```bash
 cd SheetJSIonic
@@ -494,4 +537,5 @@ However, the generated files were not externally visible from the Files app.
 [^6]: See [`aoa_to_sheet` in "Utilities"](/docs/api/utilities/array#array-of-arrays-input)
 [^7]: See ["Workbook Helpers" in "Utilities"](/docs/api/utilities/wb) for details on `book_new` and `book_append_sheet`.
 [^8]: See [`write` in "Writing Files"](/docs/api/write-options)
-[^9]: See ["Developing for iOS"](https://ionicframework.com/docs/v6/developing/ios) and ["Developing for Android"](https://ionicframework.com/docs/v6/developing/android) in the v6 Ionic framework documentation.
\ No newline at end of file
+[^9]: See ["Developing for iOS"](https://ionic-docs-o31kiyk8l-ionic1.vercel.app/docs/v6/developing/ios) and ["Developing for Android"](https://ionic-docs-o31kiyk8l-ionic1.vercel.app/docs/v6/developing/android). The Ionic team removed these pages from the official docs site and recommend the `vercel.app` docs site.
+[^10]: See the [JDK Archive](https://jdk.java.net/archive/) for Java 17 JDK download links.
diff --git a/docz/docs/03-demos/17-mobile/05-capacitor.md b/docz/docs/03-demos/17-mobile/05-capacitor.md
index 92651ab..fb427e2 100644
--- a/docz/docs/03-demos/17-mobile/05-capacitor.md
+++ b/docz/docs/03-demos/17-mobile/05-capacitor.md
@@ -1,5 +1,6 @@
 ---
-title: CapacitorJS
+title: Storing Sheets with CapacitorJS
+sidebar_label: CapacitorJS
 pagination_prev: demos/static/index
 pagination_next: demos/desktop/index
 sidebar_position: 5
@@ -10,10 +11,17 @@ sidebar_custom_props:
 import current from '/version.js';
 import CodeBlock from '@theme/CodeBlock';
 
-The [SheetJS NodeJS Module](/docs/getting-started/installation/nodejs) can be
-imported from any component or script in the app.
+[CapacitorJS](https://capacitorjs.com/) is a mobile app runtime for building iOS
+and Android apps.
 
-The "Complete Example" creates an app that looks like the screenshots below:
+[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
+data from spreadsheets.
+
+This demo uses CapacitorJS and SheetJS to process data and export spreadsheets.
+We'll explore how to load SheetJS in an CapacitorJS app and use APIs and plugins
+to extract data from, and write data to, spreadsheet files on the device.
+
+The ["Demo"](#demo) creates an app that looks like the screenshots below:
 
 <table><thead><tr>
   <th><a href="#demo">iOS</a></th>
@@ -32,20 +40,22 @@ The "Complete Example" creates an app that looks like the screenshots below:
 
 This demo was tested in the following environments:
 
-**Simulators**
-
-| OS         | Device              | CapacitorJS + FS  | Dev Platform | Date       |
-|:-----------|:--------------------|:------------------|:-------------|:-----------|
-| Android 34 | Pixel 3a            | `5.5.1` / `5.1.4` | `darwin-x64` | 2023-12-04 |
-| iOS 17.0.1 | iPhone 15 Pro Max   | `5.5.1` / `5.1.4` | `darwin-x64` | 2023-12-04 |
-| Android 34 | Pixel 3a            | `6.0.0` / `6.0.0` | `win10-x64`  | 2024-05-28 |
-
 **Real Devices**
 
 | OS         | Device              | CapacitorJS + FS  | Date       |
 |:-----------|:--------------------|:------------------|:-----------|
-| Android 29 | NVIDIA Shield       | `5.5.1` / `5.1.4` | 2023-12-04 |
-| iOS 15.1   | iPad Pro            | `5.5.1` / `5.1.4` | 2023-12-04 |
+| Android 30 | NVIDIA Shield       | `6.0.0` / `6.0.0` | 2024-06-02 |
+| iOS 15.1   | iPad Pro            | `6.0.0` / `6.0.0` | 2024-06-02 |
+
+**Simulators**
+
+| OS         | Device              | CapacitorJS + FS  | Dev Platform | Date       |
+|:-----------|:--------------------|:------------------|:-------------|:-----------|
+| Android 34 | Pixel 3a            | `6.0.0` / `6.0.0` | `darwin-x64` | 2024-06-02 |
+| iOS 17.5   | iPhone 15 Pro Max   | `6.0.0` / `6.0.0` | `darwin-x64` | 2024-06-02 |
+| Android 34 | Pixel 3a            | `6.0.0` / `6.0.0` | `darwin-arm` | 2024-06-02 |
+| iOS 17.5   | iPhone 15 Pro Max   | `6.0.0` / `6.0.0` | `darwin-arm` | 2024-06-02 |
+| Android 34 | Pixel 3a            | `6.0.0` / `6.0.0` | `win10-x64`  | 2024-05-28 |
 
 :::
 
@@ -67,13 +77,26 @@ npx @capacitor/cli telemetry
 
 ## Integration Details
 
-This example uses Svelte, but the same principles apply to other frameworks.
+The [SheetJS NodeJS Module](/docs/getting-started/installation/nodejs) can be
+imported from any component or script in the app.
+
+This demo uses [SvelteJS](/docs/demos/frontend/svelte), but the same principles
+apply to other frameworks.
 
 #### Reading data
 
-The standard HTML5 File Input element logic works in CapacitorJS:
+The standard [HTML5 File Input](/docs/demos/local/file#file-api) API works as
+expected in CapacitorJS.
 
-```html
+Apps will typically include an `input type="file"` element. When the element is
+activated, CapacitorJS will show a file picker. After the user selects a file,
+the element will receive a `change` event.
+
+The following example parses the selected file using the SheetJS `read`[^1]
+method, generates a HTML table from the first sheet using `sheet_to_html`[^2],
+and displays the table by setting the `innerHTML` attribute of a `div` element:
+
+```html title="Sample component for data import"
 <script>
 import { read, utils } from 'xlsx';
 
@@ -99,28 +122,39 @@ async function importFile(evt) {
 
 #### Writing data
 
-`@capacitor/filesystem` can write Base64 strings:
+Starting from a SheetJS workbook object[^3], the `write` method with the option
+`type: "base64"`[^4] will generate Base64-encoded files.
 
-```html
+The `@capacitor/filesystem` plugin can write Base64 strings to the device.
+
+The following example uses the SheetJS `table_to_book` method[^5] to create a
+workbook object from a HTML table. The workbook object is exported to the XLSX
+format and written to the device.
+
+```html title="Sample component for data export"
 <script>
 import { Filesystem, Directory } from '@capacitor/filesystem';
-import { utils, writeXLSX } from 'xlsx';
+import { utils, write } from 'xlsx';
 
 let html = "";
 let tbl;
 
 /* get state data and export to XLSX */
 async function exportFile() {
+  /* generate workbook object from HTML table */
   const elt = tbl.getElementsByTagName("TABLE")[0];
   const wb = utils.table_to_book(elt);
-  /* generate Base64 string for Capacitor */
+
   // highlight-start
-  const data = writeXLSX(wb, { type: "base64" });
+  /* export to XLSX encoded in a Base64 string  */
+  const data = write(wb, { bookType: "xlsx", type: "base64" });
+
+  /* attempt to write to the device */
   await Filesystem.writeFile({
     data,
     path: "SheetJSCap.xlsx",
     directory: Directory.Documents
-  }); // write file
+  });
   // highlight-end
 }
 
@@ -132,11 +166,45 @@ async function exportFile() {
 </main>
 ```
 
+:::caution pass
+
+`Filesystem.writeFile` cannot overwrite existing files. Production apps should
+attempt to delete the file before writing:
+
+```js
+  /* attempt to delete file first */
+  try {
+    await Filesystem.deleteFile({
+      path: "SheetJSCap.xlsx",
+      directory: Directory.Documents
+    });
+  } catch(e) {}
+  /* attempt to write to the device */
+  await Filesystem.writeFile({
+    data,
+    path: "SheetJSCap.xlsx",
+    directory: Directory.Documents
+  });
+```
+
+:::
+
 ## Demo
 
+The app in this demo will display data in a table.
+
+When the app is launched, a [test file](https://docs.sheetjs.com/pres.numbers)
+will be fetched and processed.
+
+When a document is selected with the file picker, it will be processed and the
+table will refresh to show the contents.
+
+"Export XLSX" will attempt to export the table data to `SheetJSCap.xlsx` in the
+app Documents folder. An alert will display the location of the file.
+
 ### Base Project
 
-0) Follow the official "Environment Setup"[^1] instructions to set up Android
+0) Follow the official "Environment Setup"[^6] instructions to set up Android
 and iOS targets
 
 :::caution pass
@@ -189,7 +257,7 @@ npm run build
 
 :::note pass
 
-If prompted to create an Ionic account, type `N` and press Enter.
+If prompted to create an Ionic account, type `N` and press <kbd>Enter</kbd>.
 
 :::
 
@@ -277,16 +345,25 @@ adb pull "/data/media/0/Documents/SheetJSCap.xlsx" SheetJSCap.xlsx
 
 </details>
 
+10) Test the import functionality.
+
+Create a spreadsheet or find an existing file. Click and drag the file into the
+Android emulator window. The file will be uploaded to a Downloads folder in the
+emulator.
+
+Tap on "Choose File" in the app. In the selector, tap `≡` and select "Downloads"
+to find the uploaded file. After selecting the file, the table will refresh.
+
 ### iOS
 
-10) Create iOS app
+11) Create iOS app
 
 ```bash
 npm i --save @capacitor/ios
 npx cap add ios
 ```
 
-11) Enable file sharing and make the documents folder visible in the iOS app.
+12) Enable file sharing and make the documents folder visible in the iOS app.
 The following lines must be added to `ios/App/App/Info.plist`:
 
 ```xml title="ios/App/App/Info.plist (add to file)"
@@ -303,7 +380,7 @@ The following lines must be added to `ios/App/App/Info.plist`:
 
 (The root element of the document is `plist` and it contains one `dict` child)
 
-12) Run the app in the simulator
+13) Run the app in the simulator
 
 ```bash
 npm run build
@@ -313,24 +390,45 @@ npx cap run ios
 
 If prompted to select a target device, select "iPhone 15 Pro Max (simulator)".
 
-13) Test the app
+The app should look like the screenshot at the top of the page.
 
-Open the app and observe that presidents are listed in the table.
+14) Test the export functionality.
 
 Touch "Export XLSX" and a popup will be displayed.
 
 To see the generated file, switch to the "Files" app in the simulator and look
 for `SheetJSCap.xlsx` in "On My iPhone" > "`sheetjs-cap`"
 
+<details open>
+  <summary><b>Downloading the generated file</b> (click to hide)</summary>
+
+The app files are available in the filesystem in `~/Library/Developer`. Open a
+terminal and run the following command to find the file:
+
+```bash
+find ~/Library/Developer -name SheetJSCap.xlsx
+```
+
+</details>
+
+15) Test the import functionality.
+
+Create a spreadsheet or find an existing file. Click and drag the file into the
+iOS simulator window. The simulator will show a picker for saving the file.
+Select the `sheetjs-cap` folder and tap "Save".
+
+Tap on "Choose File" in the app and "Choose File" in the popup. In the picker,
+tap "Recents" and select the new file. After selecting the file, the table will refresh.
+
 ### Android Device
 
-14) Connect an Android device using a USB cable.
+16) Connect an Android device using a USB cable.
 
 If the device asks to allow USB debugging, tap "Allow".
 
-15) Close any Android / iOS emulators.
+17) Close any Android / iOS emulators.
 
-16) Build APK and run on device:
+18) Build APK and run on device:
 
 ```bash
 npm run build
@@ -341,6 +439,13 @@ npx cap run android
 If the Android emulators are closed and an Android device is connected, the last
 command will build an APK and install on the device.
 
+:::note pass
+
+In some tests, the last command asked for a target device. Select the Android
+device in the list and press <kbd>Enter</kbd>
+
+:::
+
 :::caution pass
 
 For real devices running API level 29 or below, the following line must be added
@@ -362,13 +467,17 @@ to the `application` open tag in `android/app/src/main/AndroidManifest.xml`:
 
 ### iOS Device
 
-17) Connect an iOS device using a USB cable
+19) Connect an iOS device using a USB cable
 
-18) Close any Android / iOS emulators.
+20) Close any Android / iOS emulators.
 
-19) Enable developer code signing certificates[^2]
+21) Enable developer code signing certificates.
 
-19) Run on device:
+Open `ios/App/App.xcworkspace` in Xcode. Select the "Project Navigator" and
+select the "App" project. In the main view, select "Signing & Capabilities".
+Under "Signing", select a team in the dropdown menu.
+
+22) Run on device:
 
 ```bash
 npm run build
@@ -378,5 +487,9 @@ npx cap run ios
 
 When prompted to select a target device, select the real device in the list.
 
-[^1]: See ["Environment Setup"](https://capacitorjs.com/docs/getting-started/environment-setup) in the CapacitorJS documentation.
-[^2]: The [Flutter documentation](https://docs.flutter.dev/get-started/install/macos?tab=ios15#enable-developer-code-signing-certificates) covers the instructions in more detail. The correct workspace is `ios/App/App.xcworkspace`
\ No newline at end of file
+[^1]: See [`read` in "Reading Files"](/docs/api/parse-options)
+[^2]: See [`sheet_to_html` in "Utilities"](/docs/api/utilities/html#html-table-output)
+[^3]: See ["Workbook Object"](/docs/csf/book)
+[^4]: See [the "base64" type in "Writing Files"](/docs/api/write-options#input-type)
+[^5]: See [`table_to_book` in "HTML" Utilities](/docs/api/utilities/html#create-new-sheet)
+[^6]: See ["Environment Setup"](https://capacitorjs.com/docs/getting-started/environment-setup) in the CapacitorJS documentation.
\ No newline at end of file
diff --git a/docz/docs/03-demos/17-mobile/06-flutter.md b/docz/docs/03-demos/17-mobile/06-flutter.md
index 0bf1078..bc193e6 100644
--- a/docz/docs/03-demos/17-mobile/06-flutter.md
+++ b/docz/docs/03-demos/17-mobile/06-flutter.md
@@ -41,13 +41,6 @@ The "Demo" creates an app that looks like the screenshots below:
 
 This demo was tested in the following environments:
 
-**Simulators**
-
-| OS         | Device            | Dart    | Flutter  | Dev Platform | Date       |
-|:-----------|:------------------|:--------|:---------|:-------------|:-----------|
-| Android 34 | Pixel 3a          | `3.2.2` | `3.16.2` | `darwin-x64` | 2023-12-04 |
-| iOS 17.0.1 | iPhone 15 Pro Max | `3.2.2` | `3.16.2` | `darwin-x64` | 2023-12-04 |
-
 **Real Devices**
 
 | OS         | Device            | Dart    | Flutter  | Date       |
@@ -55,6 +48,13 @@ This demo was tested in the following environments:
 | Android 29 | NVIDIA Shield     | `3.2.2` | `3.16.2` | 2023-12-04 |
 | iOS 15.1   | iPad Pro          | `3.2.2` | `3.16.2` | 2023-12-04 |
 
+**Simulators**
+
+| OS         | Device            | Dart    | Flutter  | Dev Platform | Date       |
+|:-----------|:------------------|:--------|:---------|:-------------|:-----------|
+| Android 34 | Pixel 3a          | `3.2.2` | `3.16.2` | `darwin-x64` | 2023-12-04 |
+| iOS 17.0.1 | iPhone 15 Pro Max | `3.2.2` | `3.16.2` | `darwin-x64` | 2023-12-04 |
+
 :::
 
 :::danger Telemetry
diff --git a/docz/static/cap/App.svelte b/docz/static/cap/App.svelte
index 0a56296..6faf795 100644
--- a/docz/static/cap/App.svelte
+++ b/docz/static/cap/App.svelte
@@ -18,9 +18,19 @@ onMount(async() => {
 async function exportFile() {
   const elt = tbl.getElementsByTagName("TABLE")[0];
   const wb = utils.table_to_book(elt);
-  /* generate Base64 string for Capacitor */
+
+  /* export to XLSX encoded in a Base64 string  */
   const data = writeXLSX(wb, { type: "base64" });
-  /* write */
+
+  /* `writeFile` cannot overwrite, so try to delete file first */
+  try {
+    await Filesystem.deleteFile({
+      path: "SheetJSCap.xlsx",
+      directory: Directory.Documents
+    });
+  } catch(e) { /* ignore error */ }
+
+  /* attempt to write to the device */
   await Filesystem.writeFile({
     path: "SheetJSCap.xlsx",
     data,
diff --git a/docz/static/cap/and.png b/docz/static/cap/and.png
index 90885d5..f12cc03 100644
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