The quality of images imported and exported is not lost.
Open the Photos app on your MacBook.
Step 2: Tap on 'Compose' and use the paperclip icon to add attachments.
You can turn this option off at the bottom of the screen before setting the wallpaper.
This will open the file manager.
But other iPhone models can copy in the Camera roll and Set iPhone 13 Wallpaper on the lock screen or home screen.