You can share PDF or ZIP files in the community by uploading them into a post. They will then appear in the Files section of where you post (for the whole community, or the group you posted in).
Each member has 1Gb of space for file uploads and files cannot be larger than 50Mb in size, so the smaller the better to improve download speed for everyone.
Look out for these icons when you start a post:
When you click these, you can choose “Files” to begin your upload.