If you don't already have it, download the Dropbox mobile app for easier exporting.
To export a file from the Dropbox mobile app:
- Launch the Dropbox app.
- Tap … (ellipsis) beside or under the file you'd like to export.
- Tap Export. A list of apps that can open the file will appear. Select the app you'd like to open the file.
Note: Once you export the file to another app, any changes to the file may not be saved back to your Dropbox unless the app specifically integrates with Dropbox.