An update to macOS and how Apple’s File Provider API works will soon force apps like Dropbox to end support for external drives.
Some Dropbox users have encountered issues with their external drive setup on Macs running macOS Ventura. This is due to a change to Apple’s File Provider API that will require cloud storage providers to place system files within ~/Library/CloudStorage.
This Dropbox update has come as a surprise to users that rely upon local external storage for projects stored and synced with Dropbox.
Read more at AppleInsider.com