1- Go to Instagram, choose post then click the Three dots like below
2- Click Copy Link
3- Go back to REGRAM APP and click PAST BUTTON
4- Click download button
5- A popup will show, showing all post photos and videos click DOWNLOAD in the bottom.
6- At download section, you will see the number of downloaded photos just click to see the download history.
7- Click on the photo you downloaded
8- Click on 3 dots
9- Choose from the list if you want to copy caption or share or repost to Instagram again
contact me @dev.mokh if you have any problem