To post a carousel you need a PDF.
Posting a carousel is the same as posting an image or video. Here are the exact steps.
Click on “Write” button - this will open the post-composer.
Click on the document icon under the composer
3. This will allow you to select the PDF that you want to publish
4.Once you select it, it will show up in the composer and you will need to give it a title
5.Make sure to wait for some time as PDFs can take some time to load
After that, you can see it in the preview mode of the composer.
Once you are ready, you can schedule it or post it immediately as well by using one of the posting options.
Note: Follow guidelines for the size of the PDF.