iCloud: Add photos to My Photo Stream
You can manually add photos from iPhoto or Aperture to My Photo Stream. For example, you can add photos you took on your iOS device or imported on your computer while My Photo Stream was turned off.
Note: On a Mac, you can manually add photos even if you selected Automatic Upload (when you set up My Photo Stream in iPhoto or Aperture).
On a Mac using iPhoto or Aperture
For instructions, see one of these Help topics:
On a Windows computer
Open File Explorer (Windows 8 or later) or Windows Explorer (Windows 7), select iCloud Photos, then go to Uploads.
Add photos or videos to the Uploads folder.
If you have trouble adding to My Photo Stream, see the Apple Support article Get help using My Photo Stream.
For a list of file types that can be added to My Photo Stream, see the section “What photo formats does My Photo Stream support?” in the Apple Support article My Photo Stream FAQ.