If you have opened a document you will be able to see the download action icon and if you have write access to the document also the new revision icon.
The icons and the hamburger menu will be located towards the top right and can look something like this:
Download latest revision
The download icon and hamburger menu action on a document page download the latest revision of the document, even if you are looking at a previous revision you will get the latest revision with this action.
If you want to download previous revisions of a document you can do so in the revisions menu of the right information menu.
New revision
This has the same behavior as the new revision action in the document list.
Link and unlink
This has the same behavior as the link and unlink action in the document list.
New draft
This has the same behavior as the new draft action in the document list.
Move
This has the same behavior as the move action in the document list.
Create model
This has the same behavior as the create model action in the document list.
Remove model
this has the same behavior as the remove model action in the documents list
Preview
This has the same behavior as the preview action in the document list.
Delete
This has the same behavior as the delete action in the document list.