title: Complex data-driven test reading multiple files
body: <p>I have one example where i was not able to achieve my problem with Karate. I have 25 ecg files where I should upload them to a patient. There's an index file which contains the right order of those files. But before uploading via API, I need read that index file, find the next file to upload.</p>
  
  <p>Also i need to rename those file with a specific naming convention cause every file i upload via api should.be unique. The name consist of patient email, a timestamp and an index. Also timestamp in the name should be increased for each file with 25500ms. After the upload, i should delete those files.</p>
  
  <p>I tried to write a java interop,etc but then it became so complicated.</p>