Shuttle version:
v2.0.3
Device, OS:
Xiaomi Redmi Note 4 MTK | Android 6.0 (2017-12-05)
Description of bug:

When I try to set the Artist artwork, I am presented with an error message;
Enable Documents in Settings > Installed apps first
which, of course, means that I cannot set the artwork.
I am wondering where the message is coming from, either Shuttle+ or the OS. It is difficult to resolve as neither Shuttle+ nor the OS have a setting of 'Enable Documents' within Installed apps, at least that I could find.
At least if I know what process is spawning this message, it may lead to a clue as to how to resolve it.
Since I last had to update/add any artwork, both Shuttle+ and Phone have had updates. All previous artwork was manually added.
Steps to reproduce:
- Select Artist from Artist list.
- Tap on vertical ellipsis to open menu and select "Choose artwork".
- Tap "Gallery".
Expected outcome:
Previously Shuttle+ would have you navigate through storage to a folder containing artwork, then the required picture could be selected by name.
Observations/Actual Result:
Pop-up error message "Enable Documents in Settings > Installed apps first"