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WordPress template snippet to display an image from a CMB file field. Make sure you've registered your CMB field with 'save_id' => true. When the field is saved, the attachment ID will be saved in a custom field and can be accessed by appending _id to your chosen custom field id.
<?php $attachment_id = get_post_meta( get_the_ID(), '_cmb_image_id', true ); ?>
<?php if ( ! empty( $attachment_id ) ) : ?>
<?php echo wp_get_attachment_image( $attachment_id, 'thumbnail' ); ?>
<?php endif; ?>
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