icloud photos not sync stuck at 1%

Hi heyitsray123,

​Thank you for using the Apple Support Communities. I understand your iCloud Photo upload seems to be paused, and it looks like there might be a few factors based on your screenshot.

First, does it help if you connect to Wi-Fi instead of cellular data?

How about if you fully charge your iPhone, connect it to power, and ensure it's now in Low Power Mode? It looks like this information from the article Set up and use iCloud Photos might apply:

"Your collection uploads to iCloud each time your device connects to Wi-Fi and your battery is charged. When you have iOS 11 or later, your library updates over cellular too. Depending on your Internet speed, the time it takes for you to see your photos and videos on all of your devices and iCloud.com might vary."

You might also check to make sure the upload isn't paused, using these steps from the above resource:

"Pause library uploads to iCloud

When you turn on iCloud Photos, the time it takes for your photos and videos to upload to iCloud depends on the size of your collection and your Internet speed. If you have a large collection of photos and videos, your upload might take more time than usual. You can see the status and pause the upload for one day.

• On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud > Photos. You can also open the Photos app, go to the Photos tab, and scroll to the bottom of your screen.
• On your Mac, open the Photos app. Select Photos in the sidebar, then click Photos or Moments in the list of tabs in the toolbar. Scroll to the bottom of your photos and click Pause."

I hope this helps get you started. Take care.