def upload(button, pictures, enhancer=None, slack_bot=None):
    """Check upload targets and upload accordingly."""
    # TODO Test this

    # bool(int('1'))) ? I know, I'm fun at parties
    email = get_bool_key('Output', 'mail')

    actions = eval(button['action'])

    upload_targets = set_upload_targets(actions)

    mail_list = []
    # Why trust positions of file names, if we could trust,
    # that files ready for upload are always *.jpg
    uploads = []

    for picture in pictures:
        if picture.find(".jpg") != -1:
            uploads.append(picture)
            if enhancer is not None:
                enhancer.join()  # Waits until enhancer terminates

    for action, activated in upload_targets.items():
        if activated:
            if action == 'slack':
                upload_to_slack(uploads, slack_bot)
            else:  # Can only be either slack or mail
                mail_list.append(action)
    if email:
        upload_by_mail(uploads, mail_list)

    print("done uploading")