Error to custom application install when applying UID/PID

Hi all,
I am having an issue with resilio-sync from linuxserver using the custom app (not using yaml). The installation went fine, but…

The problem is that when I apply custom user (568/568) in the Security Context Configuration section, I cannot access the Resilio Sync Web GUI.

However, if I delete the custom user parameters, I can access the Web GUI, but the application loses all write/read errors. What am I doing wrong here?

Might want to post your docker-compose.yml