title: Writing and overwriting data to file (.csv)
body: <p>is it possible to write data to .csv, without downloading it? There is a downloadButton and downloadHandler, but they write data and then downloads it.</p>
  
  <p>If first thing is possible, is it possible to write data to csv and overwrite. For example, I have a .csv file with values and I want to change the values in that csv just overwriting them.</p>
  
  <p>The idea is that, I want to store some values in the .csv which a loaded on start up. Even though, user wants to change some of them and save it for next time, therefore I need to change them. And next time altered values are loaded.</p>