Apple introduced new format HEIC in iOS 11, which saves up to 50% storage space for iPhone iPad updated to iOS 11, but such HEIC photos can't be opened in Windows or other device.
"I forgot iPad screen passocde and now I’m locked out of my iPad! I don’t want to lose any of my data, is there any way to unlock iPad or recover data on it?"
To view HEIC image on your Android, Windows and Mac, it is recommended to use a program like HEIC converter to convert the images to JPG or PNG format without losing any quality.