title: jQuery-File-Upload rename file before upload
body: <p>I'm using the lib <a href="https://github.com/blueimp/jQuery-File-Upload" rel="noreferrer">jQuery-File-Upload</a> to upload a file on my aws s3 bucket. 
  My problem is I would like to rename my file before the upload because if there is special characters on the filename, the url returned by aws is not correct and I can't open it in my controller rails.</p>
  
  <p>Is there a way to override a function in the lib to rename the file?</p>
  
  <p>Thanks,</p>