[KDP PUBLISHING] Is There A Limit to the PDF File Size on KDP That You Upload?

Yes there is a limit to the size of the PDF you can upload on KDP.

The limit is 650 MB. 

It would be very hard to go over this size, 86.2% of the books made in BB are under 20 MB and 9.6% between 20 and 50mb. 3.6% are 50 to 100 MB, leaving .6% over 100 MB.

Consider using less images if you have a lot of them on each page.

For more details see this article at KDP Save Your Manuscript File the first row in the table mentions the file size limit.