You can see the history of sending and receiving files in the 'History' menu.
You can also tap Filtering icon at the top right corner to split the list into 'Sent' and 'Received'.
Long-press a history item to switch to edit mode. Select items you want to delete or select ○ in the upper left corner, then tap Delete.
Select an item to see a list of files. Tap a file item in the list to launch it or zoom in on it. You can also select files from the list to resend it. However, the files must be saved in the download folder you specified.