Hi, I am developing an application using Vuforia where I would like the users to upload their own 3D models to be added (as upload) in real time (actually before starting the game) in the scene. Is that possible? What am I missing? Thanks for your help

I am developing a game in Augmented Reality with Vuforia that should be capable of using users 3D models (e.g. characters, obstacles)before the games begins (upload and pre-processing). My ultimate goal would be to upload also terrain or locations/3D Environment (if the game is played in Virtual Reality) in "Real Time". Is that possible? And if so, which format should the 3D models be stored for the upload?