Unfortunately, the current LinkedIn API that we use does not support Polls or PDFs.
The LinkedIn API only supports status updates, links, single and multi-photo posts (up to 9 photos), videos and GIFs.

Limitations:

Photos can be of any format and there's not limit on the size. Videos can be up to 10 minutes long and up to 1 GB.

Videos will be posted natively on both LinkedIn Personal Profiles and Company Pages.

GIF's need to be less than 8 MB and will work on both LinkedIn Personal Profiles and Company Pages.

We have a thread for LinkedIn Polls here and for PDF Files here, where you can subscribe to for updates so that you get notified once that is supported by the API.

Take a look at what all the supported post types are here
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