upoadPhoto.kt

//the upload method
fun uploadPhoto(
    context: Context,
    imageUri: Uri,
    contentResolver: ContentResolver,
    fileKey: String
): String {
    var url = ""
    val stream = contentResolver.openInputStream(imageUri)
    if (stream != null) {
        Amplify.Storage.uploadInputStream(
            fileKey,
            stream,
            { message ->
                showToast(context = context, "Upload Successful:$message", Toast.LENGTH_SHORT)
                Log.e("Amplify", "Upload Successful ${message.key}")
                val uploadedFile = getUploadedFileUrl(fileKey)
                url = uploadedFile
            },
            { error ->
                showToast(context = context, "Upload failed,", Toast.LENGTH_SHORT)
                Log.e("Amplify", "Upload Failed", error)
            }
        )
    }
    return url
}

//the call site
//the image uri can be gotten from the phone camera or the gallery
uploadPhoto(
    context = context,
    imageUri = imageUri,
    contentResolver = context.contentResolver,
    fileKey = "${localUserId}${getCurrentTimeMillis()}.jpg"
     )