How to add a video thumbnail
To choose a thumbnail for a video you’ve uploaded to Dropbox:
- Log in to dropbox.com.
- Click All files in the left sidebar.
- Find and open the video you want to update.
- Drag the playhead to the frame you want to use as your thumbnail.
- Click the Set this frame as thumbnail icon (image with an arrow pointing upwards) in the lower right corner.
The thumbnail will update anywhere the video appears, including shared links.