Hello, I finally figured out a simple workflow after a lot of tests if you have the issue as me in Godot:
- Import the FBX in Blender
- Remove the Armature, only keep the mesh (Body, mesh...) Remove the vertex groups. Anything related to animations
- Export the mesh as a .obj
- Import the .obj in Mixamo and use the autorig feature
- Download animations you want and import them in Godot (Download at least one anim with skin)
- Then you just need to extract the .res animation and add them to your animation library as usual.
- Reparent the mesh textures in Godot as well, Mixamo doesn't upload textures for some reason