Thank you for the response, I look it up!
EDIT : It seems that the ScanAsync is present in the version 3.8.5, but I am currently using the 184.108.40.206 (pro). And I can't find it either in the script, nor in the 220.127.116.11 doc. Has it been deprecated? Do I need to downgrade to 3.8.5 in my project?