We made a mistake. The group chat avatar upload currently only uses the 0xchat file server. You might not be able to connect to the 0xchat file server due to network issues, but others can.
Anyway will fix it soon.
Discussion
Ah! Hmm. I will keep checking on that. Thanks!
When I tried to zap within the TSP group I got this error. I was able to switch wallets and successfully zapped. 
are you trying to deposit sats to your ecash wallet?
No. I chose my bluewallet but got that error trying to zap 42 sats to someone in an 0xchat group. I backed out to my settings and chose a different wallet and it went through. Or, it looked like it did. No error at least and a small measage below the persons post that a zap was sent.
Do you care to send us a direct message in order to assist?