FYI, to answer the question in the first paragraph of the article I just did a test upload and it worked on my free account, I have 40,000 photos on Flickr and

FYI, to answer the question in the first paragraph of the article I just did a test upload and it worked on my free account, I have 40,000 photos on Flickr and chose not to continue my Pro account, but I think 99% of my photos had a Creative Commons license.