I have tried twice already take characters fbx to blender to edit stuff more for my liking (remove piercings, change the size of the hat) but something constantly breaks the animation connection when i bring it back. So far one notable difference i have seen that in original file the character mesh is facing floor while my edited one its upright. Can people give me better advice on how to do this and what im doing wrong. maybe something goes wrong in export/import phase
To specifically fix the mesh being sideways, when exporting your FBX, under Transform, set Up to Y Up, and Forward to -Z Forward. This happens because Unity uses the Y axis for up, but blender uses the Z axis for up, so you need to tell it to export with Y as up.
To fix the animation connections, I’m not exactly sure what you mean by that, but try re-adding all your animation controllers.
If you can’t find a controller for one, leave it as default.
Best of luck and let me know if you need more help!