I found the answer here https://developer.apple.com/design/human-interface-guidelines/ios/icons-and-images/image-size-and-resolution/
So if your images are within the 1x (100px by 100px), 2x (200px by 200px), and 3x (300px by 300px) restraints, they will be resized appropriately by the system. Pretty cool.
Endriago
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
From
San Antonio, TX, United States
Post
Replies
Boosts
Views
Activity
I tried downloading other images and imported them to the assets, just like they did on the video, but the images are too big. Like someone mentioned, it would be nice to at least know the dimensions required for this example to work. I guess I'll need to play around with the dimensions for a while before I can move forward with the example.