Getting files INTO the space isn’t a problem… this is my process:
I have my dropbox public pushed into a bit.ly link that I remember. I can safely download files from that onto one machine in the space. But then moving files from one computer to the other requires a flash drive. I am reluctant to use my own, for obvious reasons. I guess I could buy a usb stick that I use ONLY for the space, but that only protects me, not every other member.
There really isn’t any security risk in creating a shared file-server. I mean, presumably someone could purposefully install malware/other unspeakables on it, but at that rate, they could do the same with the other computers in the space. Especially if we crontab some kind of “all files are deleted weekly” functionality… it looks like the safest solution to me.