Setting up Matrix behind Swag?

I have been using Swag/letsencrypt for years now and it has been rock solid.
Now I need to set up Matrix (https://matrix.org) behind it, it has special needs this app. As seen here
So I followed the nginx part of it all and got this proxy-conf:

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    #8008?
    listen 8448 ssl http2 default_server;
    listen [::]:8448 ssl http2 default_server;

    server_name matrix.*;

    include /config/nginx/ssl.conf;

    location ~* ^(\/_matrix|\/_synapse\/client) {
        proxy_pass http://10.1.1.200:8008;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $host;

         client_max_body_size 50M;
    }

}

I have opened 8008 and 8448 in the firewall to let traffic pass through to the server.
Synapse it setup using docker-compose:

version: "3.3"

services:
    synapse:
        image: "matrixdotorg/synapse:latest"
        container_name: "synapse"
        volumes:
            - "./data:/data"
        environment:
            VIRTUAL_HOST: "mysub.domain.com"
            VIRTUAL_PORT: 8008
            LETSENCRYPT_HOST: "sub.domain.com"
            SYNAPSE_SERVER_NAME: "mysub.domain.com"
            SYNAPSE_REPORT_STATS: "yes"
        networks: ["server"]

    postgresql:
        image: postgres:latest
        container_name: postgresql
        restart: always
        environment:
            POSTGRES_PASSWORD: super-advanced-password
            POSTGRES_USER: postgresqladmin
            POSTGRES_DB: synapse
            POSTGRES_INITDB_ARGS: "--encoding='UTF8' --lc-collate='C' --lc-ctype='C'"
        volumes:
            - "postgresdata:/var/lib/postgresql/"
        networks: ["server"]

volumes:
    postgresdata:

networks:
    server:
        external: true