Ist es möglich für mehrere Alben das gleiche Bild auf einmal hochzuladen? Oder geht das nur einzeln?
The same image to multiple albums is not possible.
Can I ask why you would need that?
Tracks don’t support custom images though. You can only add extra images per 1 full album.
Sorry to say I don’t have a workaround to add “the same image” to multiple albums. You could perhaps make all these albums part of a “box set” - and then set that image as the front cover of that box set 
That’s a good idea, thx