Hello,
Indefinite camera shake doesn’t work. That is if you put a negative length into the Oscillation Duration parameter for a camera shake class it should shake indefinitely. Seems like it doesn’t work since version 4.8.
Here’s another caseanswers.unrealengine.com/questions/265590/play-camera-shake-not-working.html
Current workaround is to put an extremely high number into the parameter. But it will stop eventually.