Sadly artist arts are not handled in the same way as album arts. For albums, there’s a bunch of ways to get the pictures to show up. Sounds like that’s already working fine for your library.
But for artists our options are pretty limited. As far as I know, we can only:
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let the app search the internet and find its own pictures to use
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set the picture for an artist manually
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set up “artist.nfo” files which are paired with the image files to use
Option 1 is the only automatic option, and is what you’ve probably already done. To check, you can go to Settings > Manage Media Providers. You’ll see something like “Local Device” with a three-dots menu button. Tap that, and choose Edit.
On this screen, one of the first options will be a toggle labeled “Scrape additional artists metadata.” With this setting enabled, the app will look for the artist pictures online. All you’d have to do is confirm changes and let the app “Sync” your files.
(Note that this grabs Biographies and other stuff from the internet too, not just pictures.)
I’m guessing it’s already on though, isn’t it? If so, all you can really do is Option 2–fill the holes manually, the way I’ve described earlier.
To make it a little easier, you can go to Library > Artists, and then tap the Filter button (looks like three, stacked lines in a triangle). Then at the bottom under Smart Filter, you can tap “Add rule” and under Artist, tap “Local Thumbnail” and then “is missing” and “Save.”
This should make it so that only the artists with no pictures appear in the list, so that you don’t have to go looking for them. But setting the pictures will still be manual. (If it didn’t work, try again but tap “Thumbnail” instead of “Local Thumbnail”.)
Option 3 is much more advanced and requires another software to set up easily… And in the end, it’s still pretty manual. (It can be done on a computer though.) I’ll link the doc page in an edit… (Linked here)
But it lets you drop the picture files (manually) into a very specific folder layout for the app to use. It also requires setting up some text files for each artist, but that can be done mostly automatically through a software called Kodi.
(Kodi can search for pics online too, but I don’t know if that will find anything that Symfonium didn’t already.)
It ends up being more work, but is more permanent than setting it through this app like in Option 2. (Since this way lets you keep a backup the folders once you’re done.)
