How to show image with native galley app?

Hello

I have app which has a button.
and If user click button and select one image from gallery, then Image is displayed below of button.
what I want to do is when user click image displayed, I want to redirect to native gallery app and show that image.
the reason is that on ionic, I can’t zoom-in or zoom-out …

how can I redirect to gallery app?

let cameraOptions = {
      sourceType: this.camera.PictureSourceType.PHOTOLIBRARY,
      destinationType: this.camera.DestinationType.FILE_URI,
      quality: 100,
      targetWidth: 1000,
      targetHeight: 1000,
      encodingType: this.camera.EncodingType.JPEG,
      correctOrientation: true
    }

    this.camera.getPicture(cameraOptions)
      .then(file_uri => {
          if(v==1){
            this.questionPic = file_uri;
            }else{
              this.answerPic =  file_uri;
            }