I downloaded the sample app(VuforiaSamples-6-2-6, added my license key to the code. I also imported the target database to my app according to this article: https://library.vuforia.com/articles/Solution/How-To-Add-a-Device-Database-to-a-Vuforia-Project. When I click on "Object Reco" on the main page, it doesn't recognize the object in my target database. All I see is the picture taking screen with a Vuforia logo at bottom left, as shown in the picture below. Does anyone know how to correctly use the sample app to recognize objects? Thanks!