Since updating to Windows Rstudio 2022.12.0+353 (R4.2.2 and Windows 10 22H2), we cannot save to a UNC path ( \\ network path). We can save to a drive letter mapped to the same exact network location. It appears the code that handles the path to saving in 2022.12... needs looked at. Rstudio 2022.07.2+576 can save just fine to a UNC path.
If this has already been reported, please ignore. I tried searching a bit but I am new to whatever software is running this forum and didn't see an efficient way to search yet. Thanks!