No problem. Even though I use Synology as a NAS (it’s both a hardware and software company that produces NAS hardware and a pretty consumer-friendly operating system to run on the NAS hardware) a lot of what I’m doing using Docker on it is just based on information cobbled together from tutorials. I’ll do my best to explain though.
When you set up a lot of Docker containers on Synology you’re instructed to supply the PGID and PUID of the admin user of the Synology OS the Docker install is on. The default is 101/1026 (which I confirmed with the “id” command when logged into the terminal on the Synology box). I think this is so you can access the volumes on the Synology for data storage outside the Docker container (like keeping the Minecraft servers in /minecraft/mineOS/ on the main storage volume).