I will try to find another solution (this one works perfectly nice for me on my windows laptop by the way)
On the other hand the result was rather neat. If an equally good "platform independent" solution can't be found, it could be asked why the "Apple tail" should be allowed to wag the "Windows/Android dog"!
A simple link could still be provided for those Apple users who are imprisoned by brand image and loyalty and/or have too much money to swap to a more "open" platform! And I write as someone with an iPod Touch and an iPad acquired a few years ago but who has "escaped".
Talking of "Platform" - an "ideal" solution would also be easily transferable to other photo storage sites. I have c85k photos on Flickr but sometimes wonder if I might not have been better using e.g Google Photos - or at least doing so from now on.