iCloud: My Photo Stream overview
With My Photo Stream, the photos you take with your iOS devices or import to your computers appear automatically on all of your devices. It’s a great way to get all your latest shots on all your personal devices.
How it works
You can take a photo with your iOS device, or import photos from your digital camera to your iPad or your Mac or Windows computer. iCloud automatically pushes copies of the photos over any available Wi-Fi or Ethernet connection to your other devices.
The photos appear in My Photo Stream on these devices:
On your Mac, in iPhoto or Aperture
On your Mac, in Photos (when iCloud Photo Library is not turned on)
On your iOS device (iOS 8 or later), in the Photos app (when iCloud Photo Library is not turned on)
On your Apple TV, in Photos or iCloud Photos
On your Windows computer, in the Pictures Library
On your iOS device (iOS 8.1 or later) or Mac (OS X v10.10.3 or later), when iCloud Photo Library is turned on, your most recent photos are uploaded to iCloud and appear in All Photos in the Photos app.
Note: When iCloud Photo Library and My Photo Stream are enabled on your iOS device (iOS 8.1 or later) your recent photos are added to My Photo Stream. New photos from devices without iCloud Photo Library are not imported into iCloud Photo Library. However, if you use the Photos app on your Mac (OS X v10.10.3 or later) and turn on iCloud Photo Library, your My Photo Stream photos from all your devices are imported into iCloud Photo Library.
To conserve storage space, My Photo Stream stores your last 30 days of photos and lets you collect up to 1,000 on your iPhone, iPad, and iPod touch. Your Mac and Windows computers can automatically download and permanently keep every picture from My Photo Stream.
If you take photos with burst mode or image stabilization, only the photos you select as favorites when using burst mode, and the final composite image shot with image stabilization, are added to My Photo Stream. If you want all burst-mode photos uploaded to My Photo Stream and your iPhone has iOS 8 or later, go to Settings > iCloud > Photos (or Settings > Photos & Camera), then turn on Upload Burst Photos.
Note: To prevent unintended or excessive use, My Photo Stream limits the number of photos that can be uploaded within a given hour, day, or month. For more information, see the Apple Support article My Photo Stream and iCloud Photo Sharing Limits.