Instagram has finally updated its app to add support for feature that Apple introduced to iOS back in 2014. You can now finally share images to the Instagram app from within Photos or other apps on iOS, using the iOS share sheet extension. You will have to enable the Instagram app from the share sheet menu first and then you will see the app in the Share option. Right now, sharing an image from other apps to Instagram does let you add caption and post the image, but you can't edit it in anyway. The funny thing is, Apple showed this feature working within Instagram app in...
Source: http://www.gsmarena.com/instagram_update_adds_share_sheet_support_on_ios-news-18667.php
