diff --git src/js/media/controllers/library.js src/js/media/controllers/library.js
index ace0028644..2acc89a586 100644
--- src/js/media/controllers/library.js
+++ src/js/media/controllers/library.js
@@ -196,7 +196,7 @@ Library = wp.media.controller.State.extend(/** @lends wp.media.controller.Librar
 	isImageAttachment: function( attachment ) {
 		// If uploading, we know the filename but not the mime type.
 		if ( attachment.get('uploading') ) {
-			return /\.(jpe?g|png|gif)$/i.test( attachment.get('filename') );
+			return /\.(jpe?g|png|gif|webp)$/i.test( attachment.get('filename') );
 		}
 
 		return attachment.get('type') === 'image';