In this case, I want to convert a tif file to a jpeg file or similar. I see I cannot add an attachment here, so let me tell you that I am in the browser (tab), and the file I want to convert is in the Preview area. I find the Convert icon, which turns out to be the batch conversion icon. I can't find a place where it says (in essence): convert the file you have in the Preview area to this format!
Sorry, either I am dumb as dirt or the this function is so easy to do that the author did not even bother to show how it should be done

Grateful for help!
Hans L