Adobe flash and Photobox...?

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Briefly, Flash is dead, but it seems that Photobox needs it to allow me to share a creation....
In detail, I am trying to show someone a book I made a while ago on Photobox - it used to be that you sent a link which opened with Flash.
Obviously it no longer works, and while I wait for Photobox to reply I wondered if anyone had any suggestions that may work ?

Thanks !