Apple has added a particularly useful iCloud Photos control in iOS 27: Sync Immediately. Its support documentation says the option prioritizes uploading the photo library instead of waiting for the usual background schedule. That matters if you take photos on your iPhone and want them in the Mac Photos library before editing or sending them. This is an actual documented control, not a speculative shortcut or a third-party synchronization trick.
Apple gives the path as Settings → your name → iCloud → Photos → Sync Immediately → For Today. It applies to iOS, iPadOS and visionOS version 27 or later. It is a priority-upload request, not a promise of instantaneous download onto every other device; network connection, iCloud processing, available storage and the receiving Mac still matter.
For a clean test, take one new photo on the iPhone, note its capture time, enable Sync Immediately, and check Photos on the Mac. Try the same test over Wi-Fi before changing any cellular-data settings. Apple warns that allowing Photos to use cellular data can increase usage, particularly with large photo and video libraries.
The old workaround was to keep Photos open, wait, and hope that iCloud decided to upload. This new switch is a better fit for a photography workflow where the source is an iPhone and the editing destination is a Mac. It does not require disabling iCloud Photos, cable syncing or rebuilding the library.
What to do today: on the iPhone, confirm iOS 27 is installed, use Apple's exact documented path and test with a fresh photo. If the option is missing, check the installed OS version before assuming the menu is broken. Keep the Apple support page bookmarked for the next time a shoot is stuck in the cloud.