It’s perfect! Do you guys already do this?
I open a letter, I take it’s picture with FairScan. The FairScan-folder on my android device gets syncthinged to the ingest folder for Paperless-ngx on my “server”. Paperless imports it, deletes the file and sets the new documents tag to inbox. I decide if the document goes to the binder for important stuff, or if I just toss it in a binder with all the paper I most likely will never touch again. Next time I look at Paperless, I edit all documents with the inbox tag and remove the tag.
I use a different app (though I’ll be checking out FairScan), but that’s pretty much exactly my workflow for things that aren’t convenient to do basically the same thing on my desktop PC & scanner.