Hi, I'm John! I will help you with this.
To help narrow down the issue:
- Is the external camera connected by USB cable or through Bluetooth?
- What exactly happens when you try to use it? For example, does the camera light turn on, or does Windows show any message?
Please also check:
- Settings > Bluetooth & devices > Cameras
- Device Manager > Cameras or Imaging devices
Do you see the external camera listed there?
If possible, share the camera brand/model and a screenshot of Device Manager after connecting it.
Click "Add comment" to let me know.