How to move large 'snapshot' file to 'hassio' running on 'proxmox'...?

New ‘hassio’ installed on ‘proxmox’.
I tried to move snapshot file to ‘hassio’ ‘backup’ folder with ‘samba’ but I get message about lack of space… See screen. The ‘snapshot’ file is ~1,2GB big.
How to move such file to ‘hassio’ running on ‘proxmox’?
Change some set-up on ‘proxmox’? I add some memory, but message is the same…

Below are ‘proxmox’ settings…