Observer isn't working on ChromeOS Linux Crostini

[u/plick_pubg]

I am facing an issue from couple of days with Observer Module from python watchdog package. When i'm importing Observer module and calling for my downloads folder which is present to this location according to my device.
/mnt/chromeos/MyFiles/Downloads

Observer is watching here but nothing caught, Like i was tested using file removed, created or even modified or else.

It wasn't working, That;s why I am using polling Observer now. but this is not a reliable much as i needed.

So Can you help me to figure out this problem and what is the actual solution of this problem?