Example using amazon s3 direct upload

HTML

<form action="https://vimeoassets-singapore.s3.amazonaws.com/" method="post" enctype="multipart/form-data">
  <input type="hidden" name="key" value="${filename}">
  <input type="hidden" name="AWSAccessKeyId" value= "AKIAJ4HTSCRXGHFTKRBQ:s7F8zhuF5KS6/xvRu+0M1jfsn70=" > 
  <input type="hidden" name="acl" value="public-read"> 
  <input type="hidden" name="success_action_status" value="201">
  <input type="hidden" name="policy" value= "eyJleHBpcmF0aW9uIjoiMjAxNC0xMC0xM1QxODoyMzoxNFoiLCJjb25kaXRpb25zIjpbeyJidWNrZXQiOiJzcHJlZWRlbW9zdG9yZSJ9LHsiYWNsIjoicHVibGljLXJlYWQifSxbInN0YXJ0cy13aXRoIiwiJGtleSIsIiJdLHsic3VjY2Vzc19hY3Rpb25fc3RhdHVzIjoiMjAxIn1dfQ==" >
  <input type="hidden" name="signature" value= "lsspLDjPbE6UL+/28bs0oOWZ82g=" >
  <!-- Include any additional input fields here -->

  File to upload to S3: 
  <input name="file" type="file"> 
  <br> 
  <input type="submit" value="Upload File to S3"> 
</form>