In this way, you could get easy access to a specific video or photo from different devices.
However, the iCloud Photos may stop working suddenly.
This post onMiniToolwebsite shows you how to fix iCloud Photos not syncing.

iCloud is a cloud storage and cloud computing service provided by Apple October 12, 2011.
Its a good way to back up files.
Till now, iCloud owns tens of millions of users.

What is iCloud Photos?
The iCloud Photos is a useful app to keeps all of your photos and videos automatically.
However, some people find their iCloud failed to sync files as usual.

To help them out, Id like to show how to fixiCloud photos not syncingin different cases.
you’ve got the option to sync any photos and videos to iCloud by enabling this feature.
However, it may go wrong and stop syncing your photos.

How to fix iCloud photos not syncing on iPhone/iPad?
ensure iCloud Photos is enabled.
Enable Wi-Fi and cellular data for Photos:
How to connect to WiFi on Windows 10?
Check the iCloud Storage
You may find iCloud not syncing when the iCloud Storage is running out.
Windows:
Go toiCloud for Windows-> openiCloud-> selectPhotos-> chooseOptions-> checkiCloud Photo Library.
Photos Not Syncing to iCloud
Many users are wondering how to sync photos to iCloud.
On Windows, you should update the Apple Software Update utility.