i do that with some line of code

add this to function.php

// change dir for anomaly images
function example_Dir( $param ){
    $param['path'] = '/home/yoursite/domains/yoursite.com/public_html/wp-content/uploads/example';
    $param['url'] = ' https://yoursite.com/wp-content/uploads/example';
    return $param;
}

then you need this

add_filter('upload_dir', 'example_Dir');
$Result = wp_handle_upload($file  , $upload_overrides);
remove_filter('upload_dir' , 'example_Dir');

done!

i do that with some line of code

add this to function.php to change the uploaded file dir

// change dir for anomaly images
function example_Dir( $param ){
    $param['path'] = '/home/yoursite/domains/yoursite.com/public_html/wp-content/uploads/example';
    $param['url'] = ' https://yoursite.com/wp-content/uploads/example';
    return $param;
}

here is the form :

<form action="" enctype="multipart/form-data" method="post" >
      <input type="file" name="file">
      <input type="submit">
</form>

then what PHP code you need is

if(isset($_FILES['file'])){
$file = $_FILES['file'];
    add_filter('upload_dir', 'example_Dir');
    $Result = wp_handle_upload($file  , $upload_overrides);
    remove_filter('upload_dir' , 'example_Dir');
}

done!