--- customfield/field/textarea/lib.php	2020-04-16 17:27:11.472888000 +0300
+++ customfield/field/textarea/lib.php	2020-04-16 17:23:29.928379000 +0300
@@ -72,5 +72,5 @@
     }
 
     // We can now send the file back to the browser - in this case with a cache lifetime of 1 day and no filtering.
-    send_file($file, 86400, 0, $forcedownload, $options);
+    send_file($file, $filename, 86400, 0, false, $forcedownload, '', false, $options);
 }