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I am using cmb2 for frontend form submission with custom post type name 'form'. But can not upload image with that. the first step is:

    array(
            'name' => 'Image',
            'type' => 'file',
            'id' => '_first_image',
            'options' => array(
                'url' => true, // Hide the text input for the url
            ),
            'text'    => array(
                'add_upload_file_text' => 'Upload your image image', // Change upload button text. Default: "Add or Upload File"
            ),
        ),

my form is:

 <form method="post" action="" id="form">
        <div class="student-image">
            <label for="student_image">Image</label>
            <input name="image" type="file" id="img" accept="image/png, image/jpeg, image/jpg">
        </div>

 <input style="color: white;" name="submit" type="submit" value="Submit">
 </form>

PHP code:

if(isset($_POST['submit'])){

$args = array(
    'post_status' => 'draft',
    'post_type' => 'form',
    'post_author' => $user_ID,
    'post_title' => $_POST['name'],
    'post_content' => $_POST['subject'],
    
);
$query = wp_insert_post( $args, false );
$image = $_POST['image'];
if(query){
         update_post_meta( $query, '_first_image', $image );
  }
}

This is my code. I can't upload any image. what can I do for uploading images and what code do I add to complete. and also add to upload only one image. can any one give me the solution. I am trying other solution but those can't work.

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