How to upload multiple image using wp_insert_post

Hello Tejas you may please alter your code below and let me know if it worked for you .

    foreach ($files['name'] as $key => $value) { 

$file = array( 
'name' => $files['name'][$key],
'type' => $files['type'][$key], 
'tmp_name' => $files['tmp_name'][$key], 
'error' => $files['error'][$key],
'size' => $files['size'][$key]
); 

$_FILES = array ("files" => $file); 
foreach ($_FILES as $file => $array) { 
$newupload = my_handle_attachment($file,$post_id); 

}
array_push($gallery,$newupload);

} 
update_post_meta($post_id,'_product_image_gallery', implode(',',$gallery));