How to download an image from the app's assets folder with Capacitor so that it's accessible in the Photos App in iOS - ios

Question

I want the user to be able download images from the project /assets folder into an external publically accessible folder. This works fine on Android but in iOS everything saves under the app's unique ID directory so not sure if this possible. Essentially I want the user to save a photo from inside the app and then be able to open it easily from within their phone's default Photos app.
With the final photoPath var in the code below I can display the image in a <img tag using the DomSanitizer. Though still not sure how to make the file accessible on the user's system from outside the app.
this.http.get('/assets/img/' + item.img, { responseType: 'blob' })
.subscribe(res => {
const reader = new FileReader();
reader.onloadend = () => {
var base64data = reader.result;
await Filesystem.appendFile({
data: base64data.toString(),
path: item.file,
directory: FilesystemDirectory.Documents
})
const finalPhotoUri = await Filesystem.getUri({
directory: FilesystemDirectory.Documents,
path: item.file
});
let photoPath = Capacitor.convertFileSrc(finalPhotoUri.uri);
console.log("Photo Path: ", photoPath);
}
reader.readAsDataURL(res);
console.log(res);
});