Please note that LASR X has no control over this. For example, it doesn't talk directly to your camera; only the browser does that.
If you are using a laptop, please check this post.
Regardless of the device, please ensure that camera permissions are enabled for the browser. Again, you may need to Google how to do this for your device and operating system.
LASR X will automatically ask for camera permissions from the browser if it does not already have them. You must click "allow" to enable. You might have to re-enable this manually in settings if you clicked "don't allow" or "never allow", as your browser may not allow LASR X to ask again.
We have observed web apps on Apple launched from a home screen icon cannot access the camera on iOS. This is not an issue with any other operating system. You will need to use the bookmarks bar or other means to access LASR X on iOS devices.
You can click on the "refresh camera list" button to check for new or missing cameras.
Unless your tablets or phones have a way to attach a USB device, you will be limited to the built-in cameras on those devices. You will most likely need to use a computer to use an external webcam in these cases.
Check the Master Compatibility Table to ensure that your device and browser can run LASR X.
If one device is not working well, please remember you can always switch to a different device.