trying to get audio file size, on promise return, context (this) is lost

[sdetweil]

Describe the bug
ios16, xcode 14, ionic vue 6, capacitor 4.
tried with .then() as well.

        async doLoad() {
              await  NativeAudio.preload({
                assetId: "ping",
                assetPath: "sonar-ping-95840.mp3",
                audioChannelNum: 1,
                isUrl: false
            })
                this.LogIt("ping getting audio duration")
            let result= await  NativeAudio.getDuration({
                    assetId: 'ping'
                })
            let r = result.duration * 1000
            this.LogIt("in ms =" + r)
            this.setms(r)

see output

⚡️  To Native ->  NativeAudio getDuration 58430391
⚡️  [log] - 1676737401023 ping getting audio duration
⚡️  TO JS {"duration":1.0187755102040816}
⚡️  [log] - 1676737401025 in ms =1018.7755102040817

then
⚡️ TO JS undefined
⚡️ TO JS undefined

tried calling from IonicViewDidEnter()
and created()
tried using self instead of this

I am trying to save the ms elapsed so I can wait til the play finishes, so i  don't keep chopping it off while playing. 
not clear if play waits to return until finished. 

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Desktop (please complete the following information):**
 - OS: [e.g. iOS] Mac OS
 - Browser [e.g. chrome, safari]  this is native mode app
 - Version [e.g. 22]

**Smartphone (please complete the following information):**
 - Device: [e.g. iPhone6]  iphone 12
 - OS: [e.g. iOS8.1] ios 16.2
 - Browser [e.g. stock browser, safari]???
 - Version [e.g. 22]???