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Thanks for the reply, once I changed my code to what you suggested everything worked as expected.

thanks, got me close enough that I now have an idea about what I'm doing.

I appreciate the answer though if I replace the code you and your documentation have provided I get an error for line 3

<?php 
	$group = rwmb_meta( 'car' );
	$image_ids = $group['image_key'] ?? : [];
	foreach ( $image_ids as $image_id ) {
		$image = RWMB_Image_Field::file_info( $image_id, ['size' => 'thumbnail'] );
		echo '<img src="' . $image['url'] . '">';
	}
?>

Even though it says image_key and not image_id I tried it as above, then replaced the 'image_key' with the id for my image, same result for both attempts, error line 3

It's easy enough to get the post ID in a repeater. I have code in another plugin which causes the display of the id as a column when I display all the posts.

Placing this code:

<?php
    $postal =  get_the_id();
       echo $postal;
    $values = rwmb_meta( 'music', $postal ) ;
    foreach ( $values as $value ) {
        echo $value;
        echo '<br />';
    }
?>

I get the display
598I Don't Need the Booze by Alan Jackson
Redneck Love Gone Bad by Diamond Rio
You Turn Me On by Tim McGraw
That Don’t Impress Me Much by Shania Twain

598 Is the ID for that particular Post and each subsequent post has the correct ID as well yet I am still getting the error.