Enfold Gallery & Single Image – Display

Good morning Guru’s

Am wondering which Enfold PHP theme file to use (and where, within the file, to place) the following ACF shortcode generator code?
*************
<?php
$image_ids = get_field(‘gallery’, false, false);
$shortcode = ‘
**************

If successful the short codes would be used in a Single Image and a Gallery element to the post as per code below:

1 Single Image Enfold Code:
[av_image src='ACF single image code HERE' attachment='' attachment_size='featured_large' align='center' animation='no-animation' link='' target='' styling='' caption='' font_size='' appearance=''][/av_image]

2. Enfold Gallery Code
[av_gallery ids='ACF Gallery image code HERE' style='thumbnails' preview_size='portfolio' crop_big_preview_thumbnail='avia-gallery-big-crop-thumb' thumb_size='shop_catalog' columns='3' imagelink='lightbox' lazyload='avia_lazyload']

The other Possible ACF codes snipets to be used for image display??? :
4. Single image
<?php
$image = get_field(‘image’);
if( !empty($image) ): ?>
” alt=”<?php echo $image[‘alt’]; ?>” />
<?php endif; ?>

AND

5. Gallery
<?php
$images = get_field(‘gallery’);
if( $images ): ?>

<?php foreach( $images as $image ): ?>
• “>
  ” alt=”<?php echo $image[‘alt’]; ?>” />
  
  <p><?php echo $image[‘caption’]; ?></p>

<?php endforeach; ?>

<?php endif; ?>

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Once again not sure which file (eg Index.php or Single-portfolio.php)?
Many thanks in advance!
Chris