In the Camera Settings section there is an option to attach a camera to a vehicle/unit and there is two ways to do this.
From the camera's settings
Go to Cameras ➡ Camera settings.
Clicking on the Settings button for the camera device, and go to the "Camera information" tab.
Next to "Assign to vehicle", click on the input field. A dropdown menu will appear, presenting a list of vehicles available for selection.
Choose the desired vehicle from the dropdown menu.
Click Update to confirm the attachment.
From the Overview table
Go to Cameras ➡ Camera settings.
On the Overview tab, find your camera device.
Click on the pencil icon situated in the Vehicle column.
A drop down menu will appear with a list of available vehicles. From this list, select the desired vehicle.
To finalize the attachment process, click the OK button.