If you will no longer need a document that is stored in the cloud you can delete it from the cloud. NOTE: There is no "undo" if you delete a document you would need to manually re-upload the document. 

1. Click Cloud in the left-hand navigation panel.
2. Click the hyper-link for the document you wish to delete.

   

3. Click Delete.
4. Click OK to confirm that you wish to delete the file. 

Also see: Deleting Folders from the Cloud.