From en.secnews.gr
The transport tool data of Facebook allows them users to transfer photos and video on Dropbox (and Koofr) without having to download and upload them back to platform.
To make the transfer, you must first log in to Facebook (from your computer) and log in to your account. Then click the up arrow in the upper right corner and select “Settings and privacy”.
On the Settings & Privacy menu, click “Settings”.
Open the “Oi information on Facebook ”from the left part of the window. Then, click the “View” button next to “Transfer a copy of your photos or videos”.