Ahh - ok. No real experience with E-Filing. It was SERIOUSLY broken end of last year due to the rule changes and everyone and their mother filing for form 1s and form 4s.
I refuse to keep documents on my phone - I can easily see them saying in court "he handed me the phone to look at a document, so he agreed to a search of his phone"....
One of my friends copies & laminates them. I will likely follow suit.
One of the reasons I don't carry the paper documents with me anymore, is the fear of losing them or misplacing them. Not that I am prone to lose them, but if I do, there is a lot of personal information on there along with the name of my trust, address, and description and serial number of the NFA items. If someone were to find it, I now have a big neon sign on my house saying there are NFA items, among many other goodies, to steal. It may be paranoid, but at least I know that if they are in my dropbox, I can retrieve them from not just my phone, but my laptop or whatever wherever I am, and show or print a copy if I need to. I have never had to show anyone my stamps yet though, so it has not come up. I don't have to hand over my phone to bring up a document and show someone if I had to.