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it probably means that their website has composed the object dynamically within the client using JavaScript, and so the file actually doesn't exist... you need to link the page you can link, and then instructions to find the file... or download from there (as the browser will have it composed) and then upload to here
Velocio-
Ah yes, uploading would be better, you're right. And having just checked and tried to c&P the blob: URL, it doesn't work any more, so whatever it is that it linked to must have expired. C&ping worked fine last night.
Also, Microcosm seems to have inserted '%C2%AD' into the URL when I c&p it, but it doesn't work with this removed, either.
Planning portals are often odd--this one doesn't seem to allow direct links to planning documents. I have no idea why. It also generates these documents as 'document.pdf', so you have to rename them all the time, which is a pain.
I'll navigate back to them to upload them and will remove the bonkers URLs.
Oliver Schick
Yes, no idea on all of that. It just came up because I wanted to link to the GLA planning portal. No idea why it uses that. If you leave 'blob:' off, the URL doesn't work. I can well imagine it being insecure and abused as a feature in certain contexts--perhaps to mask what people are clicking on? Screenshotting wouldn't work so easily for the longer document, as it's lots of pages. As I said, it's not important; people who want to read boring planning documents will be able to c&P the full URL and be confident it's not an unsafe link. Thanks for looking at it, though.