Image.save_png("user://image_name.png") does not save image in reachable location in Android export

[ghost]

Godot version:

3.2.3

OS/device including version:

Pixel 2, Android 9

Issue description:

Tried saving an image in the user directory with Image.save_png(). It didn't work. I enabled read/write to external storage perms and asked the user to grant them (the popup appeared). I printed the error code and it was 0. I went into my files but I don't see anything that looks like the image I saved.

Edit: Found the file with adb, but I'm not sure how to get to it by using my phone. I want the images to be saved in a place that the user can easily access them.

Steps to reproduce:
Get the data of the texture of the default icon and save it with Image.save_png().

Minimal reproduction project:

Test.zip

[dalexeev]

Use the OS.get_system_dir() method (docs). user:// paths don't fit here. On Android, the root user-accessible directory is usually /storage/emulated/0.

[Calinou]

See also #39414.

[ghost]

Okay, so here's how I'm trying to save the image:

1 - Save to "user://".

Result:
Image is saved to "/data/data/org.godotengine.nameofproject/files/image.png".

How to access from phone:
No clue.

2 - Save to OS.get_system_dir(OS.SYSTEM_DIR_PICTURES).

Result:

E 0:00:31.060   save_image: Can't saveNG at path: '/storage/emulated/0/Pictures'.
  <C++ Error>   Condition "err" is true. Returned: err
  <C++ Source>  drivers/png/resource_saver_png.cpp:58 @ save_image()
  <Stack Trace> Global.gd:181 @ save_file()

How to access from phone:
Pretty sure this isn't an actual path but a representation, it says "emulated" in the path. I printed OS.get_granted_permissions() and yes I have read/write external storage perms.
I printed out the error code and it was 12 --- File: Can't open error.

[ghost]

I have managed to save the image in a reachable location, finally. I eventually ended up creating a new directory recursively at "/sdcard/Android/data/org.godotengine.nameofproject/files/" and saved the image there. It seems to also be deleted automatically when I uninstall the app as well.

[Calinou]

To solve this, should we make Image.save_png() and Image.save_exr() create directories recursively if the target directory doesn't exist?

[volzhs]

we have already Directory.make_dir_recursive(path).
I think this issue is about documentation for "How to save a visible custom file to other apps on Android?"

[ghost]

Yeah, that was my issue. I couldn't find an answer to that in the docs.