Chrome Version:69.0.3473.0 (Official Build) dev (64-bit)

OS: Chrome OS - 69.0.3473.0 (Official Build) dev (64-bit)

Platform	10820.0.0 (Official Build) dev-channel eve
Firmware Version	Google_Eve.9584.151.0
Customisation ID	GOOGLE-EVE
ARC	4861648

What steps will reproduce the problem?
(1) Visit https://drop-test.glitch.me/
(2) Drag the 'Drag this. It's supposed to be a file (Blob)'
(3) Drop it in to the Files App.


draggerBlob.addEventListener('dragstart', event => {
      const file = new File(['hello world'], 'testing.png', {type: 'image/png'})
      event.dataTransfer.effectAllowed = 'all';
      event.dataTransfer.setData('DownloadURL', URL.createObjectURL(file));
    
      console.log('dragstart - blob', event, event.dataTransfer.items)
    });


What is the expected result?

Chrome should start a download of the file that is referenced in the data transfer object and download it to the Downloads Folder.

The above code should start a download of the file on the site. 

This code works on Windows and Mac.

What happens instead?

Nothing, the Files App looks like it can receive the 'drop' but nothing is downloaded.