Unity my database not an option for Model Target Behaviour

I used the Vuforia Object Scanner app to create an .od file and add it to my database as an object target. The database successfully downloads as a Unity package and imports into Unity; I can see it under the list of databases in the VuforiaConfiguration. However, when I create a ModelTarget GameObject and try to set the database field of the Model Target Behaviour script, the only options are EMPTY and VuforiaMars_ModelTarget. I tried creating a new database with only the object target in it, but that produces the same result.

How can I get the Model Target Unity GameObject to reference the 3D object target in my database?

[Edit:] I used the Vuforia Model Target Generator to generate a model target from an .fbx file and imported the created package into Unity. By this method I was successfully able to set the database and target for the ModelTarget Prefab. Do model targets only work with the MTG? On a related note, is my limit of 10 model generations a lifetime limit or will I get more chances next month or something?