title: Upload, read, write and download HTML file in SAPUI5 application
body: <p>I would like to create a SAPUI5 application in which an HTML file can be uploaded. The contents of the file should be read in the next step. After the header tag, an additional text will be inserted in the content and the new file will be made available for download. To make it more clear:</p>
  
  <ol>
  <li>Upload existing HTML file</li>
  <li>Edit HTML file with additional text</li>
  <li>Make edited HTML file available for download</li>
  </ol>
  
  <p>Any ideas? </p>