Question How to set read/write enable for an imported 3d model from an external source on runtime? Thanks

Hello, I'm trying to make an app where people can choose a 3d model from their device, and use it in the app, so I'm trying to use Mesh.CombineMeshes on it but the mesh need to be read/write = true, so I'm stuck here, thanks.

 

if no solutions for that, alternatives:
- plugins for combining meshes (some of those work at runtime also) https://assetstore.unity.com/?q=mesh combine&orderBy=1
- https://github.com/dawid-t/Mesh-Combiner

 

thanks.