I access my Dropbox files via Safari (Mac), not via the Desktop App. When I was running Mojave I could upload 40 GB .zip files with no problem. Since updating from Mojave to Ventura the upload of even a 10 GB .zip stalls out with this message:
"You seem to be having internet issues. Hang tight and we'll resume your upload once you reconnect."
I've run Speedtest on my Internet connection both immediately before and after the attempted upload and get speeds of 54 Mbps so that error message is bogus.
What's the solution?