When I replace a file in the Documents & Files module and then publish it, there is a log of the revision history but only of the meta information . I however cannot access a previous version of the actual document file that was uploaded in an earlier revision.
There is also a style "sfItemPreviewOverlay" over the"open the file" button preventing me from opening the document. If I however remove this, I can download the file but it is always the latest version and not the historical one that was present with that earlier version.
I have tested this on a few implementations and it seems to be a consistent bug.