If you already have an existing document of that type and/or sub-type in your documents, you won't see the type or sub-type as an option.
In this case, you would need to edit the existing one from the Document Tracking section.
To upload a new version of an existing document, select the pencil icon in the Actions column and select the new file. The new version will overwrite the previous document.
If it is not in your document tracking section, verify the archived document section (as pictured below) and restore the document to upload the new one.