"Length of stream must be greater than 0." error when pasting images

Description

When we try to copy an image from Windows Photo Viewer and then paste that image in Confluence, sometimes it throws an error:

Environment

• Windows 10
• Confluence 6.0.3
• Firefox 50.1.0
• Windows Photo Viewer

Steps to reproduce:

1. Open an image on Windows photo viewer;
2. Right-click -> Copy;
3. Open a Confluence page in edit mode;
4. Right-click -> Paste;

Expected result:
The image is attached properly.

Actual Result
"Length of stream must be greater than 0."

Workaround
Use Google Chrome;

or

1. Paste and save the image with any image editor;
2. Attach the file itself rather than a selection (via drag and drop, Insert Files button, etc);