Sadly, as Neocities does not have a correct Content Security Policy header, this does not work.
when you drag over a multi media element, you get the following error (with another blob url of course):
Refused to load media from 'blob:https://multimediaviewer.neocities.org/1c427ec0-0897-4ec7-826e-2cca7fa9274b' because it violates the following Content Security Policy directive: "media-src *". Note that '*' matches only URLs with network schemes ('http', 'https', 'ws', 'wss'), or URLs whose scheme matches `self`'s scheme. The scheme 'blob:' must be added explicitly.
I did however, tried the host glitch.com/ (not the link of the app) and it did work there. This host looks pretty cool as well. But it does not have the tag descoverability aspect which Neocities has.
The working link is on glitch.me because they want to do it that way, I suppose it's called glitch.me to distinguish between the official domains on glitch and the personal domains