How to configure tftp to upload?

Question

Solaris

Colleagues, I'm not strong in nix, so do not blame me.
tftp works for downloading, but it doesn’t want to upload - it swears at Permission denied rights, despite the fact that you can write to an existing file on tftp, but you can’t create a new one. chmod -R 777 on folder made

ls -l /tftp
total 32
drwxrwxrwx   2 root     root         512 Dec 12 14:58 pub
-rwxrwxrwx   1 root     root       14995 Dec 12 17:05 running.conf

Even locally I can’t upload a file to a tftp file:

tftp localhost
tftp> put test.conf
Error code 2: Access violation

At the same time, I can replace the existing running.conf over the network:

copy running-config tftp://192.168.19.5/running.conf
14995 bytes copied in 1.166 secs (12860 bytes/sec)