Why my ACRA plugin doesn't send any data to mail message body?

Question

I have such ACRA sender class:

@ReportsCrashes(formUri = "",
mailTo = "****@gmail.com",
mode = ReportingInteractionMode.TOAST,
customReportContent = [ReportField.ANDROID_VERSION,ReportField.APPLICATION_LOG,ReportField.PHONE_MODEL,ReportField.APP_VERSION_CODE],
resToastText = R.string.crash_toast_text)

class AcraReports : Application() {
    override fun onCreate() {
        super.onCreate()
        ACRA.init(this)
    }
}

this code opens mail app via intent as I see but it doesn't upload any data to message body. Why does it happen and how to send data? I thought that this variable:

customReportContent = ... 

will send all data into mail app and fill message body, but it doesn't happen :(