How to empty Nomad cache and temporary files?

Hej folks, did you all have a good start into the New Year? I wish you a wonderful, healthy, successful and creative 2025!
My problem is: Nomad has run up to over 90 GB filespace on my iPad. Only 140 MB of it is the app itself, the rest is data and documents. I have found out that every file I ever uploaded into the app is still sitting in the iPad cache, even the deleted ones (I delete files either directly in Nomad or via the files app). I don’t see these files in the Nomad Projects folder; I only see them in the list of files the iPad settings menu lists when I check the Nomad app there. I could delete these unwanted files there one by one, but they are literally hundreds. Is there a function that lets me clear the Nomad cache and all the temp files?
As ever, I am very grateful for your help. Many thanks in advance, Richard