ACF flexslider with carousel and image caption overlay

acf_carousel.php

<div class="flexslider-home">
                                <ul class="slides">
                                  <?php while( have_rows('image_slider') ): the_row();
                                      $imageArray = get_sub_field('image');
                                      $imageURL = $imageArray['sizes']['large'];
                                      $imageThumb = $imageArray['sizes']['thumbnail'];
                                      $imageCap = $imageArray['caption'];
                                    ?>
                                        <li style="background-image: url('<?php echo $imageURL;?>');" data-thumb="<?php echo $imageThumb;?>">
                                            <?php if($imageCap) : ?>
                                                <p class="flex-caption"><?php echo $imageCap; ?></p>
                                            <?php endif; ?>
                                           
                                        </li>
                                  <?php endwhile; ?>
                                </ul>
                            </div>