So I made a custom mouse gesture to send Meta+PgDown (minimize window shortcut), but it isn't working.

Then I tried assigning a custom shortcut to KWin-Minimize Window and using it in the mouse gesture, to no avail.

The custom keyboard shortcut works, but not via the mouse gesture. Other mouse gestures are working fine.

Does anyone know why this happens and how to minimize action window using a mouse gesture?

Cut and paste

Meta+Page Down

This is what I typed... and it works