When we create a QualitySelector with the following code, it doesn't use UHD even when UHD is supported:

QualitySelector.fromOrderedList(Quality.UHD, FallbackStrategy.lowerQualityOrHigherThan(Quality.UHD)

We had to implement a workaround for this in our app:

https://github.com/GrapheneOS/Camera

// work around CameraX QualitySelector bug
private fun Quality.withFallbackIfUnsupported(): QualitySelector {
    return if (QualitySelector.isQualitySupported(camera!!.cameraInfo, this)) {
        QualitySelector.from(this)
    } else {
        QualitySelector.from(this, FallbackStrategy.higherQualityOrLowerThan(this))
    }
}

This works but led to a regression (a crash) because camera is null when the app is being opened immediately to video mode via the standard Android video capture intent. We'll try some other approaches to using QualitySector but it doesn't seem that FallbackStrategy works correctly at the moment.

Our app is open source if for some reason you can't reproduce this yourselves.

https://github.com/GrapheneOS/Camera