We have used DropBox as a professional tool for more than five years.
We are a motion picture lab and we develop and scan 8mm 16mm and 35mm film for everyone from students to top tier professionals in the Film and TV industries.
We ahve used DropBox to upload and share motion picture film scans and it has worked flawlessly.
Until Sunday 08/22/20 when DropBox failed and became a totally useless system, we get continuous "You have reached your share limit try again in 24hrs" errors which we have never seen before in more than half a decade of professional use.
Absolutely disapointing failure of what was a great system.