Importing of assets fails after tree navigation

Importing of assets does not initiate file upload after the user imports, then navigates using the left hand tree navigation.

Steps to reproduce:
1. Create a folderish document
2. Import assets using bulk import
3. After import success, navigate to another space in the left hand drawer
4. Return to the created folderish document
5. Import assets using bulk import

Failure happens after the user tries to bulk import assets to the same folderish doc.

See video link for details: http://recordit.co/XPitXgAMAF