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Unfortunately, it's likely due to the operating system or hardware you're using – since they don't meet the system requirements for Lens Studio.
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Operating System: Windows 10 (64 bit); MacOS 10.11+
Hardware: Minimum of Intel Core i3 2.5Ghz or AMD Phenom II 2.6Ghz with 4 GB RAM; Intel HD Graphics 4000 / Nvidia GeForce 710 / AMD Radeon HD 6450 or better; screen resolution of 1280x768 or higher
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Are you trying to switch to the other camera, and then automatically snap a picture through script?
You can't switch cameras through script, but you could instruct the user to switch cameras, and wait for them to do that before continuing.
For the photo, you can't activate the built in "snap" photo through scripting. But you can save a texture of the screen and display it however you want, and then instruct the user to record a snap. You can do this in two ways:
Call texture.copyFrame() on a Render Target (in Lens Studio 2.0) or Camera Texture (earlier than 2.0). This returns a copy of the camera's output at that point. You can then apply that to a screen image or billboard.
If you disable a camera, it will stop drawing to its Render Target or Render Texture. If you set your cameras up with this in mind, you can disable the desired camera while still rendering its output in a different camera. This is better than texture.copyFrame() in some ways because it doesn't use up additional memory each time it's used.
Hope this answers your question, let me know if you need any more help!
In fact you can "switch cameras through script", I have seen the Sonic Lens (a sponsored Lens for the Sonic movie), which does it.
It starts as selfie camera, and several seconds later (without user action) it automatically switches to a rear-camera experience.
I first thought they loaded another lens from the first lens, but it is also something that is supposed to be impossible.
So, could you please tell me how this can be achieved ?
I attach here the Sonic snapcode, so you can see their Lens :