saveAs static method
Shows the native "save as" UI and copies sourcePath to the chosen place.
Returns the destination (path or URI), or null when the user cancelled.
Implementation
static Future<String?> saveAs({required String sourcePath, required String fileName, String? mimeType}) =>
_call<String>("saveAs", <String, Object?>{"sourcePath": sourcePath, "fileName": fileName, "mimeType": mimeType});