I have a picture sharing app which shares pictures among your app friends. My requirement is to show my app in sharing via pop-up, when iOS user choose any photo from photo
You should follow up this documentation to show your app icon in share options,
https://developer.apple.com/library/ios/qa/qa1587/_index.html
In "Document Types",you need to specify the "public.image". so that your app will ready to handle the any image document. If you want to have particular image type say "jpeg" then you should specify the "public.jpeg"
Refer the attached screenshot from this link

