[EDIT]: I figured it out: You have to open the animation bp, then click -Window -> Asset Override Editor
Then a menu should appear where all the replaced assets are listed.
When I look at the Weap blueprint of a weapon (for example the crossbow), I can see properties for most animations and replacing them with my own animation is absolutely no problem. However some animations seem to be missing:
As you can see, no idle animations and sprint animations are missing as well. My question is: Where are they, and how can I replace them? I have tried looking in the weapon’s specific animation blueprint but that seems to be empty.