You may want to confirm Dropbox, Google Drive, etc. are not running. Those softwares can grab control of the camera, viewing it as a really nice SD Card reader to import photos. When that happens it can shutout tethering softwares from doing their ...
Yes, sorry I realize now I was not clear on that point. Yes, keep the C connection into the camera but at the computer side convert to a USB A via an adapter or hub.
The issue I have found with the R5, unlike most other cameras, is you can not turn off charging via USB-C while tethering in the settings menu. This interferes while tethering and can cause disconnects. All camera manf. recommend turning off USB-C ...
