Spreedme detailed manual for snap installs

[expressrussian]

Hello,
I cannot find a way to install/configure spreedme in fully containerized environment. If you had published an application diagram (main modules and data flows), that would help to get a big picture for the non-developers (windows users).
I have Ubuntu 18.10 server with Nextcloud SNAP (container) included. I have managed to set up HTTPS for that snap. Nextcloud works well out of the box. I have seen that it uses Apache and MySQL. I tried to install spreedme application inside the Nextcloud GUI, but it does not work out of the box. It says that it needs some webrtc. I have installed spreed-webrtc-snap 0.24.11-4 2 stable garywzl77.
Now i cannot find any information on how to configure all this in snap containers.
The README.md talks about packages and docker, but not about snaps.
Also, when the authors write about things like vhost, reverse proxy, apache, etc, they do not provide explanations about these objects and where they are located (linux host, nextcloud snap, webrtc snap).
Also, they propose to install some proxy modules, but again, how and where? On the host, or inside some snap/container?
All references to config files should have been more elaborate, because in snaps i see 3 possible config locations for EACH snap!
This is why it is impossible for me to understand in which of 7 locations to put the modifications (host, 3 locations for nextcloud and 3 locations for webrtc).
Did anybody install/test this app in full-snap environment? Does it work or i should forget about it?
Thanks