Symfonium allows you to set a local thumbnail to genres / artists and playlists. (The thumbnail is not uploaded to your provider!)
When in the detail page of one of those media type, press the 3 dots menu button.
Select Change local thumbnail
Then select what image you want to use.
- Generate from songs: Will generate an image based on the related songs. When used the first time it will use distinct images from the most present songs. If you select again this option, it will then use fully random songs.
- From file picker: Will show the standard android file picker to select an image present on your device storage.
- From photo picker: If you phone have up to date Play Services, will use the new Android photo picker to select the image.
Image is now set up.