Photos and videos

1. After logging in, go to photos.dropbox.com.
2. Click on the album from the list in the left-hand sidebar.
3. Select the photo(s) you want to remove from the album. A blue border and checkmark will appear on each selection.
4. Click Remove from album in the blue bar at the top of the page.
5. Click Remove in the pop-up window to confirm.

You can also remove a photo from an album by opening the album, double-clicking the photo to view it in full-screen, and clicking the little gear icon at the bottom right. Select Remove from album in the pop-up menu.