Squad MOTDs are pretty fast so I think TC's getting old, just kidding buddy
Then again, aren't we all
There is something wrong with them however, to the point where I'd call it a bug.
It does upload a MOTD but it does NOT display correctly.
I tried uploading a 'fuzeman.txt' MOTD consisting of:
1
12
123
1234
<snip was longer but clipping some>
and it did infact upload and display a squad MOTD showing
12
123
1234
and so on.
So it seems to NOT display the top line of text at a minimum. I only got that to display once and could NOT get it uploaded and displayed again.
The single line option in the upload dialog screen does NOT give you an option to get to a line two because as soon as you hit enter it thinks your done and uploads the single line of text for your message.