Before the forum updates, and some weeks of posts being lost, someone had asked how to prevent players from accidently deleting media from the media library. In case they didn't get my answer back then. I'll repost it for them and anyone else interested.
if you add the following line to your custom css it will hide the delete icon.
.icon-kub-trash{display:none!important;}
Then just comment it out when you want to delete media
/*.icon-kub-trash{display:none!important;} */
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