I could swear I used to save meshs in the Tool side menu (Save As) and it would keep polygroup information. I remember the only thing it didnt save was UVs which was a pain.
Should I just save via File > Save to save polygroup and uv information on a model?
Saving as a ZTL (Tool>Save As) saves polygroups, polypaint and UVs. It also saves all the subtools for the selected tool. It’s a good way of keeping a back up version of your model. But it only saves the selected tool, so make sure you have the right one selected.
Any reason why it wouldnt be then? Its happened to me twice in a row. Id work on a model with polygroups and uvs, then id save it via tool > save as… when I reload that model all UV and polygroup information is gone.