Adding mods to a modpack

I was at the point to ask the same thing, add or remove mods to a modpack would be good

Unfortunately no.

What you can try is:

1. Create your own "modpack", with the twitch app you can create your own modpack.

2. Put the mods you want (for example install the same mods as the modpack you were playing or remove mods that you don't want)

3. Create a back up of your server (Do this before doing any change to the server)

4. Change the software to Forge

5. Add every mod you have on the modpack you made on the twitch app individually.

6. Enjoy.

I recommend you downloading your world before chaning anything on the server too.