I have followed all the formatting rules and even created a test sheet of a few countries, one category column, and one numerical column. Tableau Public is able to connect with the data but then goes to a "Processing Request" window that says: "Preparing Data..." and then starts counting time. This keeps going on and on and never finishes. I've let it go to over 10 minutes for this simple sheet. I've also tried with CSV and TXT files and the same thing happens. I do not know what I am doing wrong. Can anyone advise?