This App do nothing, but add Action Extension for image.
With this Action Extension, you can pass the image/photo from app to Instagram.
If you want post the photo in cloud (like Google Photo) to Instagram, ordinary, you should save it into Camera roll, launch Instagram, select the photo to post.
Now you dont need to save it to Camra roll! Tap this Action Extension and tap Instagram button, choose Instagram. Thats all.
You can copy some photo info in Exif, TIFF, IPTC and etc as text.
Select the items and tap Copy button to copy the text to Clipboard.