Reconstruct Header Resolution For Free

Few years with pdffiller I am their client for almost 3 years. I did my best to get how it works and was making bad reviews in appstore because complicated ui on the start. I was checking out competiting editors, but I could say that other apps were even more complicated. Many things changed from that time and editor became much more user friendly, got new options for saving money and time. I am less about challenging their customer service but sometimes updates are a bit confusing.

Don't quite understand how it works as I am not a computer person except to do genealogy, and write. One cannot operate a computer without it. At least this is what I'm finding out. It all seems automatic, I would like to know more about it's function, Why's and what-fores, instead of just logging on and it appears. All I know is that it is a major function for downloading photographs and some documents. There should be a tutorial offered to those who are senior citizens and so many things are automatic. It takes understanding its function to a non-software-computer person. Guess more instruction would help.