Where is the trash-can icon (button) to delete a document incorrectly uploaded?
From the Customer Detail page, Documents, is where a "signed" document may be uploaded for record keeping. For any document which is uploaded to this section select document-type = Promissory Note.
For this document-type there will exist a trash-can "icon" command-button to delete the document if necessary. For the Project document-type, there will not be a button to delete; request assistance from the Support department.