title: Invalid file name: must contain only [a-z0-9]
body: <p>I understand why I am getting this error. My question is more: How can I solve it? </p>
  
  <p>The problem is: I am creating an Android Icon Pack and the Youtube activity name happens to include a '$'. I cannot theme this app unless I include the $ in the filename (as far as I know). I have tried to replace it with an '_' and it does not work.</p>