Stylus SA201H pen pressure not working

[Hon_Kwan]

System: Windows
Battery or AC: AC
Model: Flow x13 2 in 1. With Stylus SA201H pen
Frequency of occurrence: Always
Reset OS:
Screenshot or video:
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Detailed description：
SA201H supports 4096 touch sensitivity, but I tested it with paint tool sai and it doesn't seem to work. The program works fine as I tested the software's sensitivity setting with another drawing tablet hooked up to this computer.
Is there some kind of driver I need to install for the new computer?

[Blake_ASUS]

Hello Hon,
You are using the GV301Q? may we have the specific model? QC?QE?
And does normal finger touch working on the screen?
or if you use another program with the pen, does it work?
Thank you.