Okay - if you simply need some web storage space for a few megabytes of data then there are plenty of free options, I think. I use
this provider. I have several "servers", each one capable of storing 200MByte. Generally I simply use FTP and file date stamps to keep users updated with the latest file levels, but I have also used a simple PHP server. The storage is totally free, no advertising is involved. You do have to log in to your control desk once a year to keep your account alive.