"iPhone 15 pro Max slow and not working well: my iphone 15 pro max with 1 tera 6 teras on icloud is so slow. i cant open photos and videos, I have to restart it constantly and stil downt work well. its lagging all the time. is it my phone that doesnt work or is there a way to fix it?"
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Troubleshooting a Lagging iPhone:
Clear Internal Storage. System file may be corrupt. Caches may have intensely uploaded. So, clear them.
Troubleshooting iPhone Storage:
Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support
So, what to do...
Clear Space Using my User Tips: