I'm using aws s3 plugin for elfinder and there is a little issue on upload

If I upload a file to root directory then file url is changed weird.
(file.url from getFileCallback, handlers.select: just after upload):
http://localhost/elfinder/connector?cmd=file&target=fls1_7Iqk7YGs66aw7IO3IDIwMjAtMTAtMTMg7Jik7ZuEIDQzNC41MjExLjEyLTEucG5n

After refresh or reconnect to finder, the file.url changes to normal.
For example (what i want):
https://davmobxdwmerj.cloudfront.net/storage/myfilename.png

In case of uploading to subfolder (not root), there are no problems. It shows correct cloudfront path.

Followings are my settings

studio-42/elfinder 2.1.57
barryvdh/elfinder-flysystem-driver v0.2.1
league/flysystem-aws-s3-v3 1.0.29

$opts = array(
    'maxTargets' => 1,
    'roots' => array(
        array(
            'driver'        => 'Flysystem',           // driver for accessing file system (REQUIRED)
            'path'          => '/',                 // path to files (REQUIRED)
            'URL'           => 'https://'.$bucket['domain'] . '/' . $base . '/',         // URL to files (REQUIRED)
            'filesystem'    => new FileSystem(new AwsS3Adapter($client, $bucket['name'], $base, $opt)),
            'cache'         => 'session',
            'acceptedName'  => 'fileNameValidate',
        ),                   
    ),
);