Hi @Jonathan Davies
Currently we could not link each list item to the related page in a Visio file as the link we get from SharePoint online belongs to the whole Visio instead of pages in it. So it will always open the last saved page (not the one relevant to that list item).
I am afraid you need to copy each of the pages to new created Visio files:
- Press Ctrl+A to select all the shapes on the page you want to copy.
- Press Ctrl+C to copy all the shapes.
- Switch to the other Visio file.
- On the destination page, press Ctrl+V to paste the shapes.
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