pdf sync on iphone and mac

Hi,
What do I need to do for my PDFs to be available to read and annotate on my phone? I currently have them on my computer. They show up but are unavailable to download.
Thank you
  • You're at your file sync quota, so additional files won't upload unless you add a storage subscription. You'd be getting an error about this every time time you sync, indicated by an icon to the left of the sync button.
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