Automatic scan library nor working?

[THHJS 0]

Hi,

I am testing Emby Server on docker and I really like it. 
I only see one thing or I am doing something wrong. 
In the library settings I have Enable Real Time monitoring. 

When I place a file in a directory of that library it doesn't "see" it. I have to do a manual scan and then it comes up in the gui. 

Is this a known issue or am I doing something wrong?
The docker environment is running on a raspberry pi 5.