iCloud Photo not back up automatically

First of all my iPhone is connected to the Internet via WiFi every night. Plugged in, charged and connected to WiFi. This suppose to automate the iCloud back up and iCloud Photo back up, only it didn’t.

What did I do wrong Apple? A notification pop up saying I have not been backing up my iCloud Photo for the pass 7 days.

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Since I subscribed to iCloud 50GB storage (should be 45GB since the 5GB is free by default) I have turn off the “Upload to My Photo Stream”. Photo stream has always been top notch! I don’t remember it never works. What’s wrong with iCloud Photo? Why it needs WiFi connection instead of auto upload via mobile data?

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Maybe I should turn on my “Upload to My Photo Stream” and things will back to normal.