Is this even possible without using a computer or having to put the SD card into a different device?
And what about renaming?
There is discussion about an alphanumeric display with the pads. I think this would meet your wish for renaming
Odo Sendaidokai from Berlin
Thanks. But my initial question: can I delete a file on the Deluge?
Unfortunately no and no using just the deluge. Please look for the delete file suggestion and up vote/comment on it. The best work around as of now is a Flash Air card and Downrush...
Do you need downrush to just add and delete content to the sd card?