I've never played with Docker but some well written how-to's and YT vids did the job. I just set up audiobookshelf on a DS220+, and now obviously I want to stream these books when I'm not home. The internet is full of info on this, but there's a lot of verbiage I'm not too familiar with yet. I do know there are already some services I am already using or are available. It seems everything I google is a sea of acronyms and terms I'm not yet familiar with. The main goal is to be able to log my mom's phone in to the ABS app without her having to run a VPN on her phone.

I already have a quickconnect domain through Synology

I already have DDNS set up on my Asus router and a domain (mydomain. asuscomm. com)

I have Asus instant guard available to me to VPN into my own network, but I don't want to use that all the time and would make sharing books with my mom a pain.

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Can I use one of the first two to access my ABS? Is it just a matter of port forwarding?