Photo stream not updating
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If you don't want to pay for the upgrade plans (up to 1T), you can look for some unlimited cloud services like Google Photos, or directly transfer the photos from i Device to local hard drive and upload photos from computer to i Cloud when mobile to mobile not syncing trouble occurs.
In reture, if your computer failed to upload photos to i Cloud, it's also feasible to sync those photos to i Phone/i Pad for smoothly syncing them to i Cloud.
One feature that made a ton of difference to how you shared photos from within the Photos app on your i Phone was Photo Stream.
i Cloud is the best way of Apple to backup and restore i Phone, while i Cloud Photo Library was introduced into i OS since the 8.3 version, Mac OS X since 10.10.3 and Apple TV since tv OS 9.2.
So any Apple devices with the eligible OS can access, upload, sync and edit the i Cloud Photo Library with related i Cloud account - Apple ID signed in.
I have logged out of i Cloud and logged back in several times to restart it. Other Troubleshotting Guides i OS Users Are Searching: Fix i Phone Not Connecting to i Tunes/Not Showing up i Tunes Quick Fix i Phone Not Showing up on Windows 10 PC Fix Wi Fi Not Working Problems on i Phone X, 8, 7, SE, 6s etc.
Fix i OS 10 Update Problems on i Phone, i Pad, i Pod i Phone 7/8/X Won't Sync to i Tunes on Windows 10/Mac Each i OS user can enjoy 5GB free i Cloud photo storage.