Previews are supported in the Multimedia Macro. Here's an example of a video embedded on my site in Confluence 6.7.1. The top one was simply by adding as an attachment, the 2nd is using the Multimedia Macro:
Can you let me know if that's what you are trying to accomplish?
You can remove the macro that was added automatically when you attached the file. The file will remain attached to the page until you delete it from the list of Attachments. Therefore, there's no need to keep the attachment box on the page.
I had a look at this, and it's supposed to automatically insert the Multimedia macro when dragging an mp4 file to the page. However, it does not and it has been reported as a bug:
I tested with an .mov file and that one DOES automatically add the Multimedia macro.
Please vote on the above bug to show you've been affected by this and you can watch it for further updates.
I seem to be having a similar issue!
When using the multimedia macro, it displays the a box where I can see the video controls, but there is not thumbnail of the video, nor any content.
However, when I drag the .mp4 file, it displays the link for the file, which when clicked, proceeds to display a pop-up that does auto-play the video.
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