Im told this was announced last week, but for those who don’t know I was happily surprised to see Instagram now allows you to post directly via your laptop/desktop browser. A rather Instagram-esque plus sign denotes your ability to perform a heretofore impossible task- save for using Sprout, naturally.
I have only tried this using Chrome, and to my elation, multi-format/carousel posts are possible. Hopefully more functionality will roll out in the foreseeable future, including (and especially) deeper analytics external to Facebook’s option.