That looks like a very challenging ride Mark!
Deleted the source data after test below, and of course, the links fail. Rebuilt ....
Got it now :)
And it's hard to copy/paste a video!
Trying Insert/edit video .... here's a relavent example! tried 2 methods ...
<video width="300" height="150" controls="controls">
<source src="https://mworthington.co.uk/PR//Ordnance Survey Map.mp4" type="video/mp4" />
</video>
OK, got it. But it's far simple to just copy paste!! (although the chaging of the imaghe size must be done first)
[IMAGE REMOVED DUE TO SIZE]
Anothe test ....
OOps, just seen /index.html#img=002-04,%20The%20Three%20Shires%20Way,%2005-10-08.jpg
I think I've got it, now.
OK, must have been a type before, so retried.
Using Insert Link to
https://mworthington.co.uk/jalbum/Cycling/Rides/2008/002%2C%20The%20Three%20Shires%20Way%2C%2005-10-08/index.html#img=002-04,%20The%20Three%20Shires%20Way,%2005-10-08.jpg
works below (Test Image via Insert Link).
Insert/edit image does not .... even though it (both actually, even the first example I used) use the same
https://mworthington.co.uk/jalbum/Cycling/Rides/2008/002%2C%20The%20Three%20Shires%20Way%2C%2005-10-08/index.html#img=002-04,%20The%20Three%20Shires%20Way,%2005-10-08.jpg
(Right click the Test Image, Copy image address).
So still confused!