I use Dropbox to store most of my files so I can share them easily, so I normaly create the projects directly on a Dropbox sync folder on my PC.
However, since some days ago, I have started getting this error when trying to create or save a .prpoj directly into a Dropbox sync folder:
An unknown error occurred while saving the project
<Name>.prproj (\\?\D:\Dropbox\<directory>.prproj

I believe the error has to do with the "?" in the start of the saving location, which I don't know why it's there. Any ideas on how to fix this issue? Both Dropbox and Premiere Pro are up to date. I've also asked on the Adobe community, but I don't know if this bug is related to Adobe or Dropbox.
Thanks in advance