Hey, I completely understand your frustration. Reading your post felt like reading my own notes — our cases are almost identical at a technical level.
I’ve been troubleshooting this for years across multiple devices and OS cycles. I’ve replicated the issue on every iPhone I’ve owned (I upgrade every launch day), and like you, I’ve gone through every documented and undocumented reset/workaround imaginable. At one point I even bought a second iPhone just so I could run side-by-side tests with fresh installs, different restore paths, and isolated variables.
Here’s the short technical summary:
- Device → device transfers: No change
- Fresh iCloud restores: No change
- Fresh setup with Messages redownload: No change
- iCloud Messages off/on cycles with multi-day indexing windows: No change
- Full erase + set up as NEW (no restore): No change
- Turning off optimize storage: No change
- Debug logs + sysdiagnose + screen recordings multiple times: Done
- Different networks (fiber, private, enterprise, 5G): No impact
- Multiple Apple IDs / test profiles: Same behavior
- Different storage levels, power states, and network conditions: No effect
Exact same failure mode every time:
Messages appears to sync, but the local photo/video grid for contacts never fully rebuilds, even though the iCloud corpus contains all media. iPad and Mac pull down the complete library instantly. iPhone never does. It stalls at some arbitrary subset (for me ~10GB visible vs 155GB actual).
This is despite the iPhone staying plugged in overnight, forced indexing periods, manual rebuild attempts, and the usual “leave it plugged in on Wi-Fi and wait” recommendations. In my case:
- 858,000 messages total
- 155GB of Messages data
- iPad + Mac = perfect, complete media grids
- iPhone = partial, inconsistent, never completes
- No correlation with remaining device storage, network throughput, or power state
The worst part is the support cycle. Every time a new senior advisor gets involved, it starts strong for the first week, and they genuinely try. By week three the communication drops off. Engineering repeatedly returns the same response: “Known issue. Sufficient logs captured. Monitor future OS releases.”
And like you, I check Software Update daily because every advisor promises, “It should be addressed in a future release.”
After years of this, and hundreds of hours spent collecting diagnostics for Apple, I can confidently say this is not a user-side configuration issue, nor is it related to corrupted backups or network environments. This is a reproducible sync/indexing bug that only affects iPhone — likely in the photo-grid metadata rebuild process or the Messages daemon responsible for reattaching media locally.
Until Apple addresses it in the OS layer, there’s nothing left for us to try.
I wish I had better news. Your story is my story — down to the hours invested. Hopefully Apple prioritizes this, because for power users with large message histories, this is a core functionality issue.