When uploading an avatar place the VRCCam infront of the model.
Right now by default it places it at -0.97 Z looking at the back of the avatar so you have to move it to ~1 Z and turn the camera 180 degrees every time.
If it spawned at 1 Z and turned 180 on Y it'll often not even need any tweaking..
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Ron Millar (CCO of VRChat)