iCloud Photo Sharing supports PNG, JPEG, TIFF and most of the RAW formats. The photos can can be 2048 pixels on the long edge and panoramic photos can be 5400 pixels wide.
As far as videos are concerned, iCloud Photo Sharing supports both MP4 & QuickTime video file types. It also supports H.264 & MPEG-4 video file types. The size is however limited up to 5 minutes in length and are delivered at up to 720p resolution.
Quick Tip to ensure your Photos never go missing
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