Hey, sorry for the bump but what worked for me, though very simple, I didn’t realize quickly, was simply choosing the correct mannequin. I imported some youtuber’s free animations and chose the skeleton to be the UE5 mannequin but as it turns out, they were made for the UE4 mannequin. After I found that out I imported them but assigned them the UE4 mannequin instead of the UE5 one and they work perfectly. Now I just have to retarget them which in UE5 takes like 3 clicks. Hope this helps anyone.