When using Media browser in IE11, there is currently a bug where the vertical tabs disappear after you Browse and select a file that is the wrong type/has the wrong extension. You also do not get any error messages (either on the page or in console).
See screenshots below (before and after browsing and selecting a file):
Closed: outdated
9.5
Last updated
Makes Drupal easier to use. Preferred over UX, D7UX, etc.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.