"Import" option in a document doesn't provide an option to cancel or reimport when selecting an uncompatible file to import.

[bertpareyn]

Browser: Firefox 13.0.1, IE 9.0.8112.16421, Chrome 20.0.1132.57m

Can the bug be reproduced: All the time

Description: Clicked on Import/Export option that appears on the right-hand side of the page. I was trying to import a video file that I know is not compatible but the user may not know and may think that it might be possible to embed a video file into the document. It throws an error message saying "Import failed: Please copy paste" but then doesn't give a option to cancel or re-import.

Steps to reproduce:

1. Click on the option Import/Export on the right-hand side of the page that appears a an icon with two arrows going horizontally outward in the opposite directions on it.
2. Click on the button "Browse"
3. Browse for a video file
4. Click on the button "Import"

Expected Result: It should provide a [Cancel] or [Re-import] option for the user to import the right file and alert the user with a message showing what file types can't be imported.

Actual Result: It throws an error message saying "Import failed: Please copy paste"

Below screen shot depicts the actual result.