I have 4 x1c, and I have not been able to send to SD since the latest firmware upgrade. I get a 1k file that shows up on the SD card with the file name. Printing directly is working fine.
I am about ready to put them all in LAN mode.
Error 5010
Failed to uplad print file to FTP please check the network status and try again
Failed sending data tot he peer: OpenSSL SSL_write: Connection was reset. errno 10054