TransferObserverAwait.kt

// Change the media parameter with your own data class
suspend fun TransferObserver.await(media: Media): Boolean =
    suspendCancellableCoroutine { cont ->
        this.setTransferListener(object : TransferListener {
            override fun onProgressChanged(id: Int, bytesCurrent: Long, bytesTotal: Long) {
                val progress = ((bytesCurrent / bytesTotal) * 100).toInt()
                media.uploadProgress = progress
                media.progressListener?.notifyProgressChanged()
            }

            override fun onStateChanged(id: Int, state: TransferState?) {
                if (state == TransferState.COMPLETED) {
                    media.isUploaded = true
                    media.progressListener?.uploadSuccess()
                    try {
                        cont.resume(true) { cont.cancel() }
                    } catch (e: AmazonServiceException) {
                        cont.resumeWithException(exception = e)
                    }
                }
            }

            override fun onError(id: Int, ex: java.lang.Exception?) {
                ex?.let { cont.resumeWithException(exception = it) }
            }
        })

    }