Assuming the Dropbox is synchronized somewhere to your file system, the FTP server could serve that directory. Although I guess not everyone synchronizes their Dropbox locally.

> Although I guess not everyone synchronizes their Dropbox locally.

And i've yet to see a pi-native dropbox client for doing so.

PS: i actually do sync dropbox to my main workstation but selectively do so. The lion's share of my dropbox is stuff i don't need locally so don't bother to sync it. The rclone approach gives me easy access to the whole dropbox, when needed, from anywhere in my intranet, and i can use my local file manager instead of the dropbox web interface.