You can post multiple images at once to some social networks.

Social networks that allow multiple image posting:

1. Facebook - up to 5 images
2. Twitter - up to 4 images

To begin, go to Publishing and then either click View Calendar and click on any given day to schedule a post, click Schedule a Post to open the post scheduler, or simply click Compose at the top of your Dashboard. Select your content group, or choose to post without a content group, and you'll get to this screen:

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Click Attach Media to start selecting the images you want to post to Facebook and/or Twitter:

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Also, please keep in mind that while you can add multiple images to a post, you cannot add more than a single GIF image to each post.