Using RawInput plugin with game pad. Sometimes input may not arrive.

Xinput display is available
Xinput has no problem.

xbox360 controller is no problem.

Would you please try it with PS4 controller etc.

https://udn.unrealengine.com/questions/435106/rawinput%E3%83%95%E3%83%A9%E3%82%AF%E3%82%A4%E3%83%B3%E4%BD%BF%E7%94%A8%E6%99%82%E3%81%AB%E3%83%9B%E3%82%BF%E3%83%B3%E5%85%A5%E5%8A%9B%E3%81%AE%E5%8F%96%E3%82%8A%E3%81%93%E3%81%BB%E3%81%97%E3%81%8B%E7%99%BA%E7%94%9F%E3%81%97%E3%81%BE%E3%81%99.html

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^{1 Open the attached project
2 Connect the game pad to the PC
3 Launched by PIE
4 Hit the button repeatedly with the game pad.
5 Result: Sometimes input may not arrive.}