ok here is what it is, coz i have the same prob but i think i can explain better
Problem is:
i use file manager to edit file, whatever, php or html. when i save changes, file is saved. when i reopen it for editing, changes are there, and everything looks fine. prob is: when i open my web page, no changfes are made. Got it now?
and yes... when i upload some pic for example, and i try to access it with web browser, i get 404.
in file manager everything is in place.
i think its coz of update. but not sure...
of course, my social network is working fine, i mean php regularily writes to and reads from files, but i cant edit it with online file manager.
didnt try ftp...