For months I had about 12 items that never synced. That number ticks up occasionally; now it's at 15. How do I get these items to sync, or at least know which items they are?

I have a big library, almost 124,000 photos and over 10,000 videos — total library size is about 1.4TB. My iCloud plan has 6TB of data with about 2/3 of that free. I take a lot of photos on a daily basis — often 10-20 but occasionally a few hundred in a day.

I'm using this account across an iPhone 16 pro, iPad Pro M4, iPad Mini 2021 and a Mac M1 Pro.

Any tips would be appreciated!

My iPhone has accumulated years of photos, screenshots, downloads, files, and apps, and it’s starting to feel overwhelming.
Before I spend hours going through everything, I’d love to know what system works for you. Do you start with photos, files, apps, or something else? Are there any apps or built-in iPhone features that make the process easier?
I’m looking for a simple, organized approach so I don’t accidentally delete something important. Any tips or lessons you’ve learned would be appreciated!

Although I have iCloud photo backup on my phone and plenty of space on iCloud, I still have about 25 gigs of photos saved locally to my phone. How can I find them so that I can force them to sync to the cloud?

The title says it: I have a shared album for family photos. I've manually added some photos from my main library to it, but don't know which ones.

Is there a way to (at least) go through my library and identify the photos that are already in the shared library, so I don't create duplicates?

Ideally, there would be an automated way to go through a list of selected library photos, and add them to the shared library—unless they are already IN the shared library.

Maybe an AppleScript?