For all objects having more than one material, bake materials into a single texture atlas and replace all the materials with one that uses the resulting texture, so that no more than one material is used per object (UV maps should be non-overlapping).
Add desired Vyzn features using a 3D editor of your choice (it must support 3D object hierarchy and FBX export).
Export your presentation as an FBX file, ensuring that it is in line with the requirements.
Upload the FBX file into Vyzn to generate a unique address for your presentation.
Press "Start Session".
Launch Vyzn on all HoloLens devices you want to use and look at the code to scan it.