The entire workflow around actions, rigs and meshes is as convoluted as anything in Blender.
Every time I press the button to stash an action, I get a new stash:
Why can’t I stash more than one animation in a stash? What’s the benefit of multiple stashes, apart from more clicking?
Also, why can’t I drag actions to the stash I want?
I’m only doing this because apparently, an action in Blender isn’t associated with any rig (maybe that’s worded wrong, because I have no idea how that would even work)? So the “send to unreal” add-on only exports stashed actions.
(Rant on: It’s so stupid that when I switch actions and have a rigged mesh selected, the animation doesn’t switch, so I have to change to the rig and switch actions, but then the keyframes disappear from the timeline.)