To let other players use Workshop in JJS, open your private server settings, click the + icon, and turn on Workshop Access. That should make the Workshop icon available for everyone in the server so they can browse and import movesets.

Steps

  1. Join or create a private server.
  2. Open server settings with the + button.
  3. Enable Workshop Access.
  4. Tell the other players to open the Workshop icon and import the moveset they want.

If it still does not work

  • Make sure you are the server owner.
  • Check whether the server is locked or restricted.
  • Try rejoining the private server, since some players reported it may be a permissions issue or bug.

Quick note

Some guides also say players may need to join the same custom server first, then use Workshop from there to import movesets.

TL;DR: In JJS, go to server settings and toggle Workshop Access on.