Change min/max filter on specific product ID"S

// Set max limit based on product id.
add_filter( 'dndmfu_wc_upload_max', function( $max, $product_id ) {

    // List of product ids and limit
    $product_ids = [121 => 10, 120 => 10, 103 => 12, 102 => 6, 101 => 4, 100 => 2];

    foreach( $product_ids as $id => $limit ) {
        if ( $product_id === $id ) {
            return $limit;
        }
    }

    return $max;
}, 10, 2 );

// Set min limit based on product id.
add_filter( 'dndmfu_wc_upload_min', function( $min, $product_id ) {

    // List of product ids and limit
    $product_ids = [121 => 1, 120 => 1];

    foreach( $product_ids as $id => $minimum ) {
        if ( $product_id === $id ) {
            return $minimum;
        }
    }

    return $min;
}, 10, 2 );