To edit a document, you can save the document locally at any time and, as usual, edit it in the corresponding application.
Supposed, you want to edit a document and to replace the original document by the edited version.
This is how it works
Select the document in the result list.
Select the context action Start editing to be entered as an editor for the document. The document contains the status Processing.
Download the document with the context action Download to save it locally and edit it.
Update the locally saved document by dragging and dropping it onto the Replace drop zone.
Save the updated document with the context action Finish editing to create a new version in the d.3 repository.
By finishing the editing process you make sure that the document in the current version is stored in the d.3 repository on a long-term basis and that the staff granted the permission to view the released document version can view the current version.