persistantdata deleted on steam build

It seems every time I upload a new build to steam I overwrite a playerinfo.dat file that stores all of the games data. Im sending all of my serialized data to this file and it loads and saves properly when im testing it locally. However, when I update my app on steam, the new build overwrites the file. I thought persistent data paths were the solution to this problem as they are read only. How can i further check if my saves are being stored properly. Ive seen that the game product name and company name have to do something with it working properly, is this true?