Help – Endoscope Viewer

Setting up

Lights on, but no pictureThe five places it can fail, in order, with one next step each.
CompatibilityCameras and browsers: tested, reported, listed only, unsupported. Dated.
USB endoscope not working on a MacIt is in System Report, but Photo Booth sees nothing.
On Windows without the appDevice Manager lists it; Windows Camera doesn't. The one-time WinUSB step.
On Linuxlsusb sees it, Cheese doesn't, dmesg says "No valid video chain found".
On an Android phoneChrome plus an OTG adapter.
On an iPhone or iPadWhy a web page cannot do it there.

Do I need this at all?Webcam-type vs UseePlus-type endoscopes, and a one-minute check.
An alternative to the UseePlus appWhat this viewer is and isn't.
LED brightness and a noisy pictureThe wheel, the grain, and Smooth noise.
"Another program has the camera"What is usually holding it.
Bazo / Geek szitman supercamera, 2ce3:3828The camera this was built on: what was tested, and a decoding fix.
Privacy and permissionsWhere the video goes, what is asked for, what the host sees.

Open the viewer Chrome or Edge on a computer, or Chrome on Android. Nothing is uploaded.