No need to apologize, I just went looking for where to point you and found it very messy. I hope these pointers will help, but please consider them from one noob to another:
https://wiki.zynthian.org/index.php/Quick_Start
I think that is for pre V5 versions but will still explain the basic idea, and hopefully get you started.
Zynthian includes the concept of “snapshot” which saves the overall state of everything and loads up “engines” and “SubSnapShots” which save the ‘position’ within a snapshot.
Here is where SubSnapShots were introduced on the forum in 2018:
I hope these pointers help. Searching the wiki and this forum for SnapShot, SubSnapShot, ZS3 will get you a lot, perhaps too much, interesting reading.