Flutter plugin allowing to share media to Instagram. Android only at the moment. Many thanks to zhouteng0217 for specific lines of code and for inspiration. Use the ShareExtend for generic share.
You can check the updated (forked) plugin with needed updates for Android here: InstagramSharePlus It will allow you to share media to iOS as well.
Just use the InstagramShare.share("path", mediaType: "video" or "image");