1. Drop a file of an allowed type
  2. Upload a file using the upload dialog
  3. Drop a file of a not-allowed type - should always fail
  4. Upload a file of not-allowed type using the upload dialog - should always fail
  5. Paste Ctrl+V from clipboard containing a file from file-explorer
  6. Paste Ctrl+V from clipboard containing an image from print-screen
  7. Paste with button from clipboard containing a file from file-explorer
  8. Paste with button from clipboard containing an image from print-screen