TFTP Ubuntu 18.04

[mahesh]

I have set up tftp server but having trouble testing / accessing from remote platforms
Setup:

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sudo apt update;
sudo apt install -y tftpd-hpa;
sudo ufw allow tftp;
put files in
/var/lib/tftpboot
testing from the remote machine times out (firewall disabled)
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tftp 109.228.38.69
tftp> get test.txt
Transfer timed out.
tftp>quit
While testing locally however on the actual server:
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tftp 127.0.0.1
tftp> get test.txt
Received 11 bytes in 0.0 seconds
tftp>quit
The server is hosted on Virtual Private Server with https://www.fasthosts.co.uk/
UFW status
69/udp (v6) ALLOW Anywhere (v6)
EDIT:
sudo lsof -i:69
returns
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COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
in.tftpd 6874 root    4u  IPv4  90405      0t0  UDP *:tftp   
in.tftpd 6874 root    5u  IPv6  90406      0t0  UDP *:tftp
cannot find much about in.tftp - is this a built in service ? Which is better to use and where are its files stored.