Cannot set up Network drive

I have a network drive attached to my router. “My Preferences” has problems when I try to assign a “models” folder to this drive. I get error messages from Preferences. Unacceptable Argument is one.
I am trying to share Sketchup files

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Sketchup often has problems that can corrupt the SU files if you save them direct to a network or cloud drive.

Save to your local hard disk, then copy them to a shared drive as a separate action.