[wp-trac] [WordPress Trac] #39625: Give an error message when a non-image is uploaded for featured image

[WordPress Trac]

#39625: Give an error message when a non-image is uploaded for featured image
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 Reporter:  karmatosed                           |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  5.3
Component:  Media                                |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing needs-       |     Focuses:
  screenshots                                    |
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Changes (by worldweb):

 * Attachment "featured_image_document_upload_validation.png" added.

 Featured image invalid file validation

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Ticket URL: <https://core.trac.wordpress.org/ticket/39625>
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