The iPhone 12 Pro models stepped up with 2.5X telephoto lens and additional low-light enhancements. Apple's article Shot on iPhone 12: Portraits, cityscapes, the night sky, is an inspirational gallery. Another resource is Use Night mode on your iPhone for iPhone 11 Pro and iPhone 12 models. Also introduced was the AppleRAW option where capturing great detail in highlights and shadows. LiDAR assists in focusing in the dark.
Read about A dramatically more powerful camera system. With the iPhone 13 Pro model Ultra Wide camera - Macro photography has come to the native Apple Camera, with a minimum focus range at 2 centimeters - just over 3/4 inch. Macro video, time-lapse and slow motion features have also been added to this 'camera bag.' LiDAR is available for all three cameras. The 3X telephoto is an upgrade and Photographic Styles have been added.
Before watching the Shayne videos below, note that I'm still not recommending that you update the Snapseed app on iPhone or iPad. Most Recent reviews are complaining that the app freezes.
As further inspiration - check out these YouTube videos by Shayne Mostyn. In addition to his tips on low-light photography, the demonstrations of processing his photos in Snapseed have taught me new tricks.
Double exposure snapseed tutorial for iOS and Android 12:56 - double exposure and masking
How to do Star Photography on iPhone 13 Pro 13:10 - Lightroom on iPhone
by Jenham's Astro
Digiscoping the Orion Nebula using Binoculars and a Smartphone 13:53 - use an app with manual controls exposure controls 1sec at ISO 3000, change format to either TIF or RAW and set focus.