Fix for showing link to file in email

[baukezwaan]

When submitted by non-authenticated user (fixes #1225)

[GuySartorelli]

In what circumstances is this method called outside of the use of that controller?

[baukezwaan]

In what circumstances is this method called outside of the use of that controller?

Probably when viewing a submission in the CMS, like the screenshot over here #1167

[GuySartorelli]

Hi @baukezwaan
Thank you for submitting this pull request.
While refining the issue this is linked to, we've defined some acceptance criteria for a successful PR to meet in order to be merged. Can you please check your PR against the acceptance criteria and see if it meets them all, and update it if it needs to be updated to meet them?

[emteknetnz]

Looked like this PR didn't have much activity for a while, so I've gone ahead and created a new implementation here so I close this one