$form['#submit'] array overwritten in betterselect_form_alter

In hook_form_alter, the code

    $form['#submit'] = array('betterselect_taxonomy_from_checkboxes');

overwrites the node_form's $form['#submit'] for any node with taxonomy. This breaks any module that attaches and relies on its own submit function before the betterselect_form_alter executes. One module affected by this bug is the Drupal core Upload module.

Adjusting that line of code to the following fixed it for me:

    $form['#submit'][] = 'betterselect_taxonomy_from_checkboxes';