Firstly, why is the file in the Download folder? Does it have to be downloaded from the cloud? If so, you can download it directly to the App's ASD folder:
UPDATE (version 3): Download with progress feature
A progress feature has been added. The progress can now be displayed in bytes / MB and as a percentage during the download. Thanks to @Kumaraswamy who is "light years" ahead of me with Java. de.bodymindpower.downloadToAsd.aix (15.2 KB)
(created using Rush - thank you again for this great tool @shreyash )
Note: The DownloadProgress event doesn't seem to complete, but it does (it just doesn't show up in time). Therefore, you should al…
However, Download is an Android shared folder, you do not need SAF to access it.
From an Android point of view there are an → Internal Storage and an → External Storage .
1. Internal Storage
The Internal Storage can only be accessed with a rooted device.
1.1 The app package is saved in
/data/data/<packageName>/
In order to be able to debug your app, AI2 saves the assets for → Companion on devices with
Android ≥ 10 (API ≥ 29):
/storage/emulated/0/Android/data/edu.mit.appinventor.aicompanion3/files/assets/
Android < 10 :
/storage/emulated/0/Android/data/edu.mit.a…