I've found a workaround (unless someone can tell me a better way) ...
If I go to the attachment link and right click to find the url, I can copy it and use it as a weblink on the other page. This effectively allows me to link to an attachment on another page.
The Link Search tab allows use to search for and add attachments from other pages.
From Atlassian Documentation
Link to an attachment on another page
Choose Link > Search and enter part of the attachment name.
Type [ and enter part of the attachment file name then select the attachment from the list
(you can hover over each suggestion to see which space the page is from).
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