When selecting a file to download from the remote session to the device (Android 11+), a black screen appears after briefly showing the panel to authorize the application to use disk permissions. After that, the app can stay black until it is closed or can be killed by the system.

Such issue occurs when the app has no permissions to write on disk, so it can be worked around by enabling them. Permissions are requested the first time the app starts or toggled from system settings. Some examples:

One UI: Settings > Apps > top right dots menu > Special access > All files access
MIUI: Settings > Privacy protection >  Special permissions > All files access

Important: disk permissions should be required only when user wants to upload a file from any allowed system folder, but they're optional when downloading a file (it would be saved in the app’s private storage).