Hello,
unfortunately I have the same problem. Maybe you managed to solve it.
The camera starts up, after downloading the application indicated in the instructions, I can see the camera, I have a preview, but it looks as if it was the maximum zoom.
There is nothing you can do in the PTZ tab. No other android app can see the camera and from what I found on the net, practically every one should. Especially for this type of camera.
Besides, when I enter the camera settings, nothing can be edited. After entering the settings and the WiFi tab, it crashes me to the main screen.
I was surprised because my friend has an almost identical webcam and works like gold. Only he bought his in the country for over 100 and I from the Far East paid 196 via Joom with a shipment for 4 pcs.
I suppose that some (including me) found very cheap and poor "versions" of this equipment. I wrote to the supplier my comments about the operation of the webcam (among other things, the offer included information about the 2800 mAh battery, and in the manual and physically it is 230mAh

but that's what I expected). We'll see if they help, but it will probably be "you have your money and ... tyryry"