Try to replace in Upload.php
this:
PHP Code:
tr("YouTube", "<input type=\"text\" name=\"tube\" size=\"80\" /><br />Samples, should be in the format of http://www.youtube.com/watch?v=TYxbGgeeVmI...t;\n", 1);
to this:
PHP Code:
tr("Trailer", "<input type=text name=tube size=80 value='".$row["tube"]."'><br>(Direct link for youtube trailer)\n", 1);