You won't be seeing block pages as you are only blocking the specific media type and not the whole web access.
If you want to block a certain site, say streaming media, do it via categories.
Now for some sites which you think should fall under streaming media category but doesnt, e.g. ndtv.com, you could block these via domain so as not to block the whole category it belongs to, like General News.
You could use URL.Host.BelongsToDomains criterium for this, create a list of domains and set the action to Block.
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