Lost most of my important photos when my phone updated to IOS 15- losing my mind
Recently my phone was acting up because of there being no storage space and it was stuck in a boot loop, so I recovered and updated it through iTunes on my Mac but now I'm missing so many photos that haven't synced back up with my laptop. I can see them all on my laptop but I'm not sure how to put them back on my phone without losing them, I really need them as there's photos of now deceased pets on there that I desperately want to keep. Please help because I'm so frustrated and confused by the advice I've found through forums and google.
iPhone XR