Facebook owns instagram so it is smart to connect these also for SEO with posts, links, hashtags etc to boost Google rankings over time.
The best and easiest way is to have the client create/supply video content and pics is via their Instagram account.
All the client has to do is shoot the images and 20 second videos with the phone once a week and upload to their Instagram account on their phone and I can download them from there and do whatever I need to do with them without being logged in (without having to go through the security flaming hoops which we all love) and then I can upload to youtube, edit and post to blogs and Socials etc.