No Syncing for Documents

It appears there’s no way to sync pdf documents I have on my mac to the Kindle Cloud Library. Yes, I am using the “Send to Kindle” app. Yes, I was able to upload my pdf document to the Cloud Library. Yes, I am able to see the document on my iPhone (which is why my review wasn’t for zero stars). But I also want to see the doc in Kindle on my Macbook Pro and it’s not there. I’ve tried everything I can think of. If someone knows of a solution I’m all ears. Until then I am very disappointed. :-(

Scott84 about Kindle Classic