Animation Software Resources

Unfortunately, you can't record your own voice overs directly on Biteable at this stage, but you can use software such as Audacity to create a voice over and then upload it to biteable. You can also read their blog regarding the same:- https://biteable.com/blog/tips/voiceover-recording-tips/ They also don't offer import ppt option in biteable but I believe they will definitely introduce this feature in future.

Yes you can create a teachers ID and connect it with other IDs as your student

3DS Max outputs its models as right handed models which most 3D packages use, Blender outputs models that are left handed. Unity uses the left handed coordinate system so Blend files for instance will import at the same orientation as they appear in Blender. I've found FBX models to not do this however Unity will rotate these models but you have to take this into account when setting transforms in script or you will get weird results. I've found it easier to attach your model to an empty GameObject as a parent and have the script modify the transfrom of that instead of the model itself.