For efficiency, the file name of the screenshot is used in the label / title of the image. 

To enable sorting, you must number the files with 3 digits like 001, 002 etc.

The numbering is usually done as follows:

  1. Numbers starting with 0xx are end-user views
  2. Numbers starting with 1xx are edit views
  3. Numbers starting with 2xx are admin views
  4. Numbers starting with 3xx are dev / code views