I don’t know if this is the easiest way, but it has worked well for me. I have a folder on my computer set up to be accessible from the local network. When I need to put some files on the deck, I switch it into desktop mode where I have a shortcut to the network folder. Then I just take the files out and put them wherever I need them on the deck.
I have been using mine to read comics recently, since the screen is larger than my phone’s and the aspect ratio is about right when turned on it’s side.
Even with the ammo production, it can barely keep up. If the trip was any longer, the ship probably wouldn’t survive.