Can't create folder in Android 10

[Taifun]

@Isaac_Perez

I have not managed to create a folder in the root directory with it.

you should not create folders anymore in the root directory
use the application specific directory already now to avoid problems in future

@Isaac_Perez

I need to save the file in a different folder than the one assigned by default, since I need the files to be preserved even if the application is uninstalled.

use the legacy mode of the file component but be aware, that starting from Android 11 you will not be able to use this anymore, from the release notes

Implement LegacyMode for File component (#2269)

Android 10 uses a new file model that prevents writing to arbitrary locations on external storage (colloquially, /sdcard/). People should migrate their files to app-specific storage, which is what the File component uses by default on Android 10. Checking the LegacyMode option will let you read files in the old locations, but will fail once App Inventor targets Android 11 (summer 2021). This has no effect on Android versions prior to Android 10.

see also

Problem with July 30 2020 Version: nb184 no longer able to write and read files

Right, but if you install the app fresh on Android 11 once App Inventor targets SDK 30 (it only targets SDK 29 right now), then you won't be able to create myDir because it is not in scoped storage. Edit: More specifically, to ease the transition App Inventor includes the requestLegacyExternalStorage flag in the manifest so that apps can still access files outside of scoped storage. Once apps target Android 11, this will be ignored (ref): Edit 2: There is also preserveLegacyExternalStorage, w…

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