I recently started learning blender and made my first model. When I try importing my model to unreal engine I have all kinds of weird problems seemingly with scale and rotation.
When I tried to apply location and rotation (I was told that might fix the exporting issues) the mirroring would break.
Apply rotation made one half of the model rotate 180° while the other half stayed in place.
Apply location made the 2 halves of my model move apart without disconnecting. The connection between them just stretched.
After manually fixing these things by rotating the entire model 90° and moving the 2 halves closer together, I was able to apply transformations without anything breaking.
I thought that fixed my issue but today I found out about Mixamo. I uploaded my model and made Mixamo generate a new rig for it (it wouldn't accept my rig probably because it had a tail.) Mixamo was able to apply it's animations to my model just fine and I downloaded the newly rigged model plus animations.
Now when I reimport the model into blender it's fingers are curled backwards, whenever I enter edit mode the entire model spins 90°, and trying to apply transformations moves it a couple meters to the side.
Now I can probably fix these things manually again but I assume this is caused by some overarching problem with my model and I would like to fix it completely before things go wrong again.