VRM files you downloaded from VRoid Hub or exported once in VRoid Studio cannot be loaded in VRoid Studio again.
(What can be edited in VRoid Studio are "*.vroid" files.)
If you wish to re-edit a VRM file, use a service such as Unity (UniVRM) or Blender.
▼Reference (external website)
- How to edit a file in Unity + UniVRM
- [Blender] How to load Vroid data (VRM)
VRM files are compatible with the glTF format, so they can be loaded by 3D software that supports glTF.
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