How to make use of autosaves?

I messed up one of my blueprints, now I went to copy one of my autosaves over to my content folder but for some reason no matter what I do UE4 just ignores it as if would not exist.
I already tried restarting the editor and deleting the CachedAssetRegistry.bin. Importing/opening any Blueprint file doesn’t even work because UE4 doesn’t know its own file type it seems. What is going on, how is this supposed to work?

Looks like it works after all, the problem is that it has the original name of the blueprint so you end up having 2 blueprints named the same. It doesn’t take over the actual file name. When you use right click “show in Explorer” you can see which blueprint it actually is. Not sure if cachedAssetRegistry deletion was required though.

Renaming it is problematic, had a crash through selecting a renamed blueprint in the default pawn class dropdown.