Unity AR Complete Walk Through with common errors identified (Speedrun?)

Unity Augmented Reality Speedrun
A complete run through a project from start to finish with UI
Needed Packages
com.unity.xr.arfoundation 5.0.7
com.unity.xr.arcore 5.0.7
Code can be downloaded from:
github.com/TemporalCoder/UnityAR

[@a16mz]

cheers sir, i may pass IT now

[@kittytangsze]

how to enable my webcam. it work in Unity Editor but black scene after built

[@lightsandclockwork]

The webcam on your actual computer? I have never tried that! I will look in to it.
AR and computers tend not to work due to no accelerometers.

[@yorkiegeek]

I cannot get the images to track and not sure why? I have followed the steps but trackables is blank. Any idea why?

[@lightsandclockwork]

If you have followed all the steps correctly, then no, not really. The only thing left might be the sources images themselves. Sometime some resolutions and images dont track.
I have resized a few in photoshop and they have started working.

[@ProbablyJamie]

Hello! I started building the app earlier, but I would get an error after a couple of seconds of building it. I found that having 4 or more Images in the Reference Image Library would trigger the error. Is there a way to fix this?

[@lightsandclockwork]

Sorry, Not sure of your error. I have just test mine with 8 images and all works.
Are file types ok? Have you tried a different batch of images?
I know unity does not like jfif files.
What does the error say?