In mid-2017, Instagram added the ability to archive posts you've previously shared so that only you could see them going forward. As easy as it is to archive one of your Instagram photos or videos, it can be just as easy to forget how to unarchive it so others can see it again in all its glory. Actually, sometimes you may archive an Instagram photo or video and forget you even did so. If you don't use the archive feature much, it's very easy to head to your Instagram profile and freak out tha...