Hardcoded /storage/emulated/0/Documents path fails on Android 11+ (scoped storage)

[chirag127]

Problem

saveToDevice writes to a hardcoded /storage/emulated/0/Documents/OpenScan path that is not writable on Android 11+ under scoped storage.

Steps

1. Install on Android 11+ device (targetSdkVersion 34, per android/app/build.gradle).
2. Scan a document and tap Save to Device.
3. Directory.createSync() on /storage/emulated/0/Documents/OpenScan throws.

Expected

PDF saves to a writable app-accessible location (e.g. getExternalStorageDirectory() or SAF-picked directory).

Actual

FileSystemException: Creation failed, path = '/storage/emulated/0/Documents/OpenScan' (OS Error: Permission denied, errno = 13). WRITE_EXTERNAL_STORAGE in AndroidManifest.xml is a no-op on API 30+.

Cite

• lib/Utilities/file_operations.dart:136
• lib/Utilities/file_operations.dart:155
• lib/Utilities/file_operations.dart:157

Environment

Flutter SDK ^3.5.3, compileSdkVersion 34, targetSdkVersion 34, Android 11+.

Thanks for maintaining ethereal-developers/OpenScan!