Nie, nenapísal si aký konkrétne, preto som sa pýtal... Ak používaš "originál" klienta DropBoxu, potom čítaj:
www.dropbox.com.
Ak nevieš na čo sa zamerať tu je výcuc:

...the mobile app usually syncs on demand only. This prevents Dropbox from consuming all of your bandwidth and space.

The mobile app shows you the list of your files, but it only downloads them as needed, such as when you tap on a file to view it. To ensure that a file is always on your device, mark it as a Favorite by either swiping left to right or viewing it in the app and tapping the star icon.