Ability to download cover file
Context
Some cover images cannot be viewed in the UI, so users cannot see it or even do a save as if they need to access it to modify it and upload a corrected version.
Proposal
Provide download support for the cover file
Design
[Include sketch or wireframes of the UI changes necessary for this feature]
Implementation (if applicable)
[A description of the steps to implement the feature.]
Alternative approaches (if applicable)
[Include any alternatives to meet this use case.]
Open issues (if applicable)
See discussion in #646 (closed)