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 22.214.171.124 (pro). And I can't find it either in the script, nor in the 126.96.36.199 doc. Has it been deprecated? Do I need to downgrade to 3.8.5 in my project?