When duplicating a sketch, media files are not copied

[catarak]

Nature of issue?

• Found a bug

Details about the bug:

• Web browser and version: Chrome
• Operating System: Mac OSX
• Steps to reproduce this bug:

1. Create a new sketch
2. Upload an image file
3. Save the sketch
4. Duplicate the sketch
5. The new sketch links to the old original AWS bucket file. This is an issue because if either one of the sketches gets deleted, then the media file link is broken.