
In February 2017, Instagram introduced the ability to post more than one photo at a time. Now, you can post up to 10 photos at once in an album. Albums show up as a single post in the feed, but your followers can swipe to see all of the photos.
To post multiple images at once, simply tap on more than one image when uploading from your device. Instagram will automatically create an inline, carousel-style album. While you can post up to 10 photos, you’re limited to a single caption for the entire album. What’s more, images must all be cropped to the same aspect ratio, so no mixing and matching of portrait, landscape, and square images.