Select the Marketing tab and then click the blue 'New Post' button in the top right corner of your page, or click on the 'plus' icon if you are in the month or week view of your planner.

Select Instagram from your list of connected accounts, then click on 'Story' from the three tabs available.

Upload your content - this can be a video or a jpeg image.

Using the dropdown menu on the 'Post' button, choose when you want your story or stories to go out.

You can add more than one image or video at a time and they will post in the order in which they were uploaded.

NB: if you would like to also upload a story with a link sticker for your customers to follow, you can do this natively, in the Instagram app. See below for more details on how to post stories using Instagram.
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Click on the '+' icon in the top right or the '+' on your profile picture.

Select 'story' in the selection along the bottom of the screen.

Tap the white circle in the middle to take a picture, hold it for a video, or tap the gallery icon in the left corner (or just swipe up) to use existing media on your phone. 

Edit your photo or video using Instagram's various editing options.

Tap the "Your Story" button to post to your public Story, "Send to" to send it privately to your followers via a Direct Message, or "Save" to download it to your phone for later.