Creating Woo-commerce custom tab with ACF custom field plugin

add_filter( 'woocommerce_product_tabs', 'woo_product_tab', 98 );   
 
function woo_product_tab( $tabs ) {
 
	      //  print_r( $tabs ); 
	        
	        $tabs['additional_information']['title']="ASSEMBLY";
	        $tabs['description']['priority']=10;
	        $tabs['videos']['priority']=25;
	       $tabs['additional_information']['priority']=15;
	       
	       
	        $tabs['additional_information']['callback']="my_custom_callback_tab";
	      
	        // adding custom tab
	        $tabs['my_custom_tab'] = array(
	        'title' => "CAD Download",
	        'priority' => 20,
	        'callback' => 'my_custom_tab',
	        
	        );
	        return $tabs;

	}
	

	function my_custom_tab(){
		
		?>
			<p> <a href="<?php echo get_field('prod_download1'); ?>"><?php echo get_field('file_download1_label'); ?></a> </p>
			
		<?php
		
		?>
			<p> <a href="<?php echo get_field('prod_download2'); ?>"><?php echo get_field('file_download2_label'); ?></a> </p>
			
		<?php
		
		?>
			<p> <a href="<?php echo get_field('prod_download3'); ?>"><?php echo get_field('file_download3_label'); ?></a> </p>
			
		<?php
		
		
	 }
	 
	 function my_custom_callback_tab(){
	 	echo get_field('prod_description3');
	 	
	 }