I was able to figure out the issue. I happened to pick a file that was corrupt. Several of my pubs were downloaded using Chrome. They display fine when downloading, open their own windows and seem ok but Chrome switched out my Adobe reader for its own pdf reader. So when they were saved, they were corrupted. When I tried to attach them to the citation file, no good. On the Chrome side, I had to go in and disable the Chrome pdf reader.
The problem was these were relative files and going into a subfolder. I had to go in and manually delete them so the program would open back up. This problem does not occur if the file is absolute. Endnote needs some kind escape if the uploaded file is corrupt, some way for the program to stay open so that the corrupt file can be deleted. Being new, I was not familiar with how the pdf’s are stored. I figured it out because I use Evernote and that program creates relative links-new copies of the pdfs are stored in a new folder.
I am not sure how this might have affected the upload to this forum given the information about preventing spam.