Btw., there is no item with ‘xls’ key in the list of allowed mime types. You should use this one instead:
unset( $mime_types['xla|xls|xlt|xlw'']
Full list of mime types allowed at WP by default is available here.
Btw., there is no item with ‘xls’ key in the list of allowed mime types. You should use this one instead:
unset( $mime_types['xla|xls|xlt|xlw'']
Full list of mime types allowed at WP by default is available here.
