So if this is how to add mods, why does the host UI include this?
Because I spent the last 30 minutes pulling each ID into a doc list and added them as per these instructions hehahehe
Mod ID(s)
You can specify a comma seperated list (or just a single) using Steam workshop IDs (the Mod ID is in the URL of the workshop page for that mod). like:
123456789,123456789,123456789
IMPORTANT! Make sure you place mods in order of priority.
The mod(s) you specify here will automatically update each restart.