tomhughes left a comment (openstreetmap/openstreetmap-website#5639)
Having now setup a test and tried this locally I think we may all have been
misunderstanding the exact problem here, mainly due to the somewhat confusing
error from the browser.
What confused me was the "redirect is not allowed for a preflight request"
which makes it sounds like the preflight got redirected but in Firefox the
complaint is simply that it got redirected to the active storage endpoint and
CORS didn't allow access to that which is in fact the real problem - that GPX
downloads get redirected to active storage but we don't currently allow cross
origin access to that.
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