How to post PDF carousels on LinkedIn:
Firstly Click Planner and then Posts. Once on the Posts page go ahead and click Create New
Go ahead and choose your LinkedIn account
Once your LinkedIn account is selected create your desired post and add pictures. After that, you click the Little LinkedIn logo as shown in the picture
After clicking It allows you to edit only the LinkedIn post, If you want to post on multiple social accounts. As shown in the picture you have the option to Post as a carousel. Go ahead and click It. You should have the preview on the right side of the screen of how your carousel post would look If you are happy with It go ahead and either schedule the post for later or post It instantly.
Once clicked you should be sent back to the Posts page with your post. If you decide to post instantly you can refresh the screen and It should have a green tick with the date that you published it.
Go to LinkedIn.com and the post should be published.