Preview of cover image in metadata is not visible
Expected behaviour
When we upload a cover image in the Metadata modal, the image box shows the preview of it like:
, when possible for the filetype and browser
Current behaviour
Preview is not available all the time. This is either because of filesize of filetype. And the user doesn't know when a preview is not expected.
Steps to reproduce
Check the example here
Proposal for fixing the issue
Replace the text 'preview' with 'Preview not available" so user know that file is uploaded but not previewed.