iMessage photos not downloading on new iPhone
Ran into this issue after getting a new phone. How do I get all of my old photos in iMessage to download and load?
iPhone 17 Pro, iOS 26
Since this is a new iPhone, it's likely still indexing your data that was recently transferred. All your data is not immediately accessible after transferring, it can take a few days to fully do so. Give it some more time and keep it on the charger plus Wi-Fi for optimality. Keep us posted.