openFile method
Opens a saved file with the appropriate system app.
Platforms: Android · iOS · macOS · Windows · Linux Web: throws UnsupportedError — files are already browser-downloaded.
uri should be a Uri returned from a save operation (for example
SaveProgressComplete.uri, or a write-session result like
FileSaverSink.result).
mimeType is optional. On Android, it is queried from ContentResolver for content://
URIs if not provided.
Android note: If uri is a file://... URI, the host app may need to
configure a FileProvider to open it.
iOS note: ph:// URIs are opened via a system preview (QuickLook).
Implementation
Future<void> openFile(Uri uri, {String? mimeType}) {
throw UnimplementedError('openFile is not implemented on this platform');
}