I have the issue that I can’t select downloaded files in Sleep as Android.
I get two errors:
1 - Not a local audio file
2 - Sorry, something went wrong.
Not all folders are accessible for apps, even if you try to grant the access there. The newer versions of the Android have some security measures on this, so the apps can only access the content of specific folders, or only its own folder. This should protect the privacy, but brings up unexpected side-effects like this.
You are very welcome