iCloud Photo Library is not updating photos between devices

6 months ago when I first purchased my MacBook Air, I was able to use iCloud Photo Library. This allowed me to access all the same photo content across my iPhone, iPad, and MacBook. Now for some reason the photos no longer transfer or update between devices, despite having my ICloud Photo Library turned on. This is inconvenient, and the only way I am able to get the photos from my phone to my Mac is to plug it in via USB and click ‘import’. I would really like this issue fixed, and thanks in advance for anyone’s input.

Cheers,

Ryan