I found this clever little hack when browsing through petapixel sometime ago. I figured this may of use to you guys. https://www.youtube.com/watch?time_continue=1&v=nu-Qo4j5YKI
many of these services eventually get shut down once instagram gets them. this method is a bit of a ghetto solution, but it works
It's easy. You only need "User Agent Plugin" for web browser. Later, change perfil to mobile and enter to Instagram web. Done, now you can do.
Thanks. I didn't understand what you meant, but had search and found instructions here http://www.thewindowsclub.com/share-photos-on-instagram-windows-pc This does images but not videos.