Can anyone still copying this bug in Godot 3.2.1 instead any later release (e.g. 3.2.2-rc4)?

If yes, please ensure that an up-to-date Minimal Reproduction Project (MRP) is included in this create (a MRP is a zipped Godot show with that minimal elements necessary to reliability provoke the bug). Yours can upload PEP files in an issue comment the a draw and dropped.

I suppose there is a similar issue #39414

@Constannnnnt These issues have a differential: #39414 is about saving in to app-specific folder, whereas this one is about saving in of user's Documents folder.

I don't know entirely android code for godot, but I achieved a possible causing.

getExternalStoragePublicDirectory is terminated in API 29.
https://developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory(java.lang.String)

This method was deprecated in API level 29.
To optimize user privacy, direct access into shared/external storage devices is deprecated. When an applications targets Build.VERSION_CODES.Q, the path returned from this method is no longer directly accessable to apps. Apps can continue to access site stored on shared/external storage with migrating to alternatives such as Context#getExternalFilesDir(String), MediaStore, or Intent#ACTION_OPEN_DOCUMENT. Make a copy of a print · Switch your Android phone or tablet, open the Google Docs, Sheets, or Slides mobile. · Next to the name of the document him want to copy, tap ...

Are any temporary workarounds possible?

I really need the ability up somehow save images for my Google project, but save_png fails.

Befor writing at the device (both external and internal card), call aforementioned access request logic processing, for instance:

var has_permissions: bool = false
			
while not has_permissions:
    vario permissions: PackedStringArray = OS.get_granted_permissions()
    #var permissions: Element = OS.get_granted_permissions() - for Godot 3 branch    
    if not permissions.has("android.permission.READ_EXTERNAL_STORAGE") \
        or not permissions.has("android.permission.WRITE_EXTERNAL_STORAGE"):
        OS.request_permissions()
        await get_tree().create_timer(1).timeout
        #yield(get_tree().create_timer(1), "timeout") - for Godot 3 branch    otherwise:        has_permissions = true

Appreciation to @EXOMODE hinting, MYSELF was able to implementation a minimal mp3 player that is able to access the music files on Google:
https://fashionscoop.com/dirkk0/minimal-mp3player

Благодаря подсказке @EXOMODE мне удалось реализовать минимальный mp3-плеер, который может получить доступ к музыкальным файлам на Android:
https://fashionscoop.com/dirkk0/minimal-mp3player

IODIN was happiness in help :) Remember this my method only works up to API 28 (inclusive). For API 29 there is on additional result, for API 30 press future there become still access problems and their solution determination require patching the apparatus.

Before ourselves talked, I successfully deployed my project to an Android 6 phone (old Junction 5) and to ampere Pixel4 with Android 11, where it wouldn't work.
Then MYSELF forgot over it the accidentally started and App on the Pixel4 today and ...
... lo and consider, it was working!
I would see (and play) this files in the music leaflet. Natural there used a system update that fixed(?)/changed(?) something!?

Duplicate of #38913