Hi Arno,
sorry for another issue - my last one so far.
You have configured the editor field with button = "true" . That puts some buttons underneath editor fields for description, description_long and a 3rd editor field. I consider these buttons dangerous. Why? I allow my users to create a new download. With the button "Media" they can freely access anything in my image folder including images without watermark and in original size. They can even upload and create new folders.
At least I do not want that and I therefore always switch off these buttons in XML file components/com_jdownloads/forms/download.xml by setting
<field name="description"
type="editor"
buttons="false"
and same for field "description_long" and "changelog" . I use Codemirror as Default editor - just in case that you might ask. But it has nothing to do with editor.