We have recently have updated some of our estate to 13.4 and we are now seeing a mix of any file transfers across the estate are failing. uploading files into Slack, teams, Jamf to name a few. It seems to be different applications for different users but we are all experiencing it.
MacOS 13.4 Not allowing Uploads
I've just updated to 13.4 and seeing the exact same issue, but with the Office suite. I've also found a similar problem here: https://forum.affinity.serif.com/index.php?/topic/186533-affinity-publisher-wont-open-afpub-files-which-it-did-prior-to-update-to-v210/