How to create a carousel/multi-photo post for Instagram:
First of all, click Planner and then Posts. Once in the Posts section of the platform click Create New.
Go ahead and select your Instagram Business account.
Once you choose your Instagram Business account go ahead and write your caption as well as add 2 or more photos to your carousel and choose whenever you want to post It now or schedule it for later.
Once you published your desired post you should have the date with green tick on your Posts page, or If you scheduled It should show as scheduled and the day.
You can go ahead and check your post, you can see that you have a little tick to the side, meaning there is more than one photo in the post.