Hi @tatimenabi
If $old_value returns a file URL, you could look to use attachment_url_to_postid()
Once you have the attachment ID, you can then use wp_delete_attachment()
Something like this:
<?php
function wpse_83587_delete_file( $value, $post_id, $field ) {
$old_value = get_field( $field['upload_my_file'], $post_id, false /* Don't format the value, we want the raw ID */ );
if ( $old_value ){
$attachment_id = attachment_url_to_postid( $old_value['url'] );
wp_delete_attachment( $attachment_id, 'true' );
}
}
add_filter( 'acf/update_value/type=file', 'wpse_83587_delete_file', 10, 3 );
Code untested but may help!
