Importing bought items

I bought the item "Modrekainen's Tomb of Foes," and can't seem to be able to import it into my games. I used to be able to toggle whether or not i import it into the game, but now the pop up for it doesn't show up.

If you mean this , it is a compendium expansion. You don't add it to your games, it becomes part of your version of the compendium.

To expand, any game using the 5e D&D Compendium (the default for the 5e OGL by Roll20 sheet, for instance), should have access to all related Compendium expansion material (Such as Mordenkainen's Tome of Foes) in the Compendium tab in-game. It should be there automatically.

I already know that the compendium is already in there, but there used to be a tab, where if i said to allow it to be in the game, it would actually add some stuff that's not in the compendium. A couple creatures, A map (or 2), and a folder full of information.

There are three types of objects besides tokens and maps that can be added to a game: 1 A Compendium Expansion: ex. Monster Manual, Volo's Guide These just appear in your compendium tab. However, if you wish to share them with your players, there is a spot in your game settings where you can decide to share them. 2 A Module: ex. Curse of Strahd. These are added to a game at creation time, and contain pages, tokens card decks, handouts, etc. 3. An Add-On: Ex. White Plume Mountain, Card Decks. These can be added to any game at any time, and contain pages, tokens card decks, handouts, etc. They are smaller than modules but bear many similarities. I think it most likely from your description that you are thinking of an Add-On.

There is an introductory adventure bundled with MKToF called Rrakkma which I believe is what you're referring to, Grryt. It's an addon, so you add it from your game's homepage. 

Yeah, that's what i'm talking about, i know where to add it from, but it's not there anymore.