If you are in the Editor, you could via a toolbar button open the mediamanager and include images that are available in the media manager (or upload the images there first and include subsequently)
If you have opened the mediamanager then it shows the current namespace in the left pane. It shows images in the right pane if there are images, otherwise just a message that nothing was found. But also it shows you directly a upload for new images.
Normally it should just show the current namespace. Or there are maybe access permission not correct, but that should be notified.
This makes overview of images available if needed for selecting a new or other one.
If you go to the detail page of an image, then there is shown an overview of all pages that link to this image.
For example
https://www.dokuwiki.org/_detail/wiki:dokuwiki-128.png?id=wiki%3Asyntax
The images that are included in current page that you are viewing are not listed separately on that page, because these images are already showed in the current page. Upload of images is available in two manners. If you like to include an image in the text you could open the mediamanager from the toolbar of the Editor. If you like to just upload files, you could open the mediamanager as linked below the search field.
So DokuWiki does organize the media handling little bit different than foswiki, but my impression is that it tries to give overview of media at the moment that you have to use/select them. Or do I miss a use case you like to achieve that does not fits?