upload (actually, upload.pl in my installation) there is a function named addLinkToEndOfTopic where there is the line:
if( $fileName =~ /\.(gif|jpg|jpeg)$/ ) {
This should be:
if( $fileName =~ /\.(gif|jpg|jpeg)$/i ) {
-- AlWilliams - 26 Sep 2000 png.
if( $fileName =~ /\.(gif|jpg|jpeg|png)$/i ) {
-- PeterThoeny - 26 Sep 2000