Smart Sync

Dropbox's Smart Sync (formerly Project Infinite) let files appear in the file manager without being downloaded — convenient, but a recurring source of confusion when 'online-only' files were unavailable offline or seemingly vanished.

Dropbox demoed 'Project Infinite' in 2016 as a way to see all cloud files on the desktop without using disk space, then shipped it in January 2017 rebranded as 'Smart Sync' — but restricted it to paying Business and Professional tiers rather than the free product its demo had implied.

Dropbox's Smart Sync feature, meant to keep files 'online-only' to free local disk space, has repeatedly failed in the opposite direction — quietly re-downloading online-only files and filling up users' drives, or reverting their carefully chosen local/online states.