Add a marketplace map to a module in progresd?

Hi there! I've been running the excellent Tomb of Annihilation module for over a year and would like to add a third party map, Minotaur Maze by Czepeku. What tier do I need to be and how can this be accomplished (if at all)?

Any tier can add assets. The only limit is on your total storage amounts and the individual asset size limit. You just need to create a new map page and drag the map image onto the VTT on the map layer. 

That set is an artpack. You can drag the elements directly onto the VTT from your Art Library's Marketplace. Free users can do this. Addons can be added to any existing games. Free users can do this. Modules need to be selected at game creation time. Pro users can move assets freely between games.

Thank you guys for the quick help. I've managed to set everything up (though I had to do the dynamic lighting walls myself -- but with the snap-to-grid function it was a breeze!). A quick follow up question: Can I export that maze WITH my dynamic lighting lines and load it into another game? I.e. where/how are those lines saved? What file format is required? Could I add lit maps (with light sources, dynamic lighting walls) to an existing game?

With a Pro account, you can move pages from one game to another with the Transmogrifier (shows up in the settings pane within the game). Each game map is a page, with all the information stored on it transferred from one game to another. Tokens keep their references if you move the tokens first or if the referent is already in the destination game (IIRC).