rather than cite a paper, I’ll cite an ap.
although there are several i use I zip. I zip allows one to zip files on the I phone and transmit directly via the web to Dropbox. The dropbox ap its self permits the easy transfer of tons of stuff.
A handler in say Damascus can put all sorts of stuff in a drop box and the lone wolf in california can access it easily via the web on his handheld computer, the locked I phone.
That is not what they asked for
They must be specific in terms of what they want