You can see the history of sending and receiving files in the 'History' menu
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You can also tap All ▼ at the top to split the list into 'Sent' and 'Received'.
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Tap Edit in the top right corner to switch to edit mode. Select the items you want to delete or tap Select All at the top to delete them.
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Select an item to see a list of files. Tap a file item in the list to launch it or zoom in on it.