In our app, you can delete files of each photo, video, and file tab.
1. Select files in the Send menu.
2. Tap the 3 dots icon in the Send box at the bottom.
3. Tap the 'Delete' button.
* The files in the Photos and Videos tabs are kept in the 'Recently Deleted' section of the Photos app(iOS native app) for 30 days and then deleted.
* Please note that once you delete a file on the Files tab, you can not retrieve it.