diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 37c56cce7ff..fbc12ca76c7 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -13431,7 +13431,7 @@ function dolIsAllowedForPreview($file)
 	}
 
 	// Check mime types
-	$mime_preview = array('bmp', 'jpeg', 'png', 'gif', 'tiff', 'pdf', 'plain', 'css', 'webp');
+	$mime_preview = array('bmp', 'jpeg', 'png', 'gif', 'tiff', 'pdf', 'plain', 'css', 'webp', 'webm', 'mp4');
 	if (getDolGlobalString('MAIN_ALLOW_SVG_FILES_AS_IMAGES')) {
 		$mime_preview[] = 'svg+xml';
 	}