why sprite mask isn't showing the particle effect ?

Hi,
I tried making a sprite mask for particle effect,
& it doesn’t show the particle effect.
It’s like the image I put inside the sprite mask is being ignored.
When I change the masking property of the particle to “Visible Outside mask”,
it shows the particles all over the screen, & when I change to “Visible Inside mask”
the particles doesn’t show at all.
What might be the reason for that & how can I fix it ?

show your sprite mask component, and screenshot of the position of the sprite mask on the scene