Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, have you added the "iCloud" app to both devices ?
Thank you for your kind understanding of system automated / machine generated ads and offers.
Still, can you please try?
Click HERE and then click on the ADD TO CHROME button.
Any updates / developments?
Installing iCloud to both/any/all devices would make the "uploaded" pictures from 1 device available to all the other devices.