fun writeToFile_Basic(data: ByteArray, file: File) {
    try {
        file.outputStream().use { stream ->
            stream.write(data)
        }
    } catch (e: Exception) { Log.i(TAG, "[writeToFile] ${e}") }
}

                                val _file = File(this@Activity.filesDir, _filename)  // 保存先のパス
                                writeToFile_Basic(_data, _file)

private val ContentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI

fun Context.insertImage(data: ByteArray): Uri? {
    val _contentValues = ContentValues()

    val _mediaUri = contentResolver.insert(ContentUri, _contentValues)
    _mediaUri?.let { writeToUri_Resolver(data, _mediaUri) }

    return _mediaUri
}

fun Context.writeToUri_Resolver(data: ByteArray, uri: Uri) {
    try {
        contentResolver.openOutputStream(uri, "w")?.use { outputStream ->
            outputStream.write(data)
            outputStream.flush()
        }
    } catch (e: Exception) { Log.i(TAG, "[writeToUri] ${e}") }
}

_uri = insertImage(_data)

fun FileCreateIntent(filename: String) =	// Clientアプリのインテント
    Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
        addCategory(Intent.CATEGORY_OPENABLE)
        putExtra(Intent.EXTRA_TITLE, filename)
        type = "*/*"
    }

fun ComponentActivity.CreateDocLauncher(callback: (Uri) -> Unit) =
    registerForActivityResult(
        ActivityResultContracts.StartActivityForResult()
    ) { result ->							// Clientアプリの結果を処理
        if(result.resultCode == RESULT_OK) {
            val _intent = result.data
            _intent?.let {
                val _uri = it.data
                _uri?.let { callback(it) }	// ※Aを実行
            }
        }
        else {
            Log.i(TAG, "ファイルが選べません !")
        }
    }

        val _create = CreateDocLauncher { uri ->    // Clientランチャーの作成
            writeToUri_Resolver(_data, uri)			// Uriへデータの書き込み（※A）
        }
		
		_create.launch(FileCreateIntent(_filename))	// Clientアプリの起動

fun Context.writeToUri_Resolver(data: ByteArray, uri: Uri) {
    try {
        contentResolver.openOutputStream(uri, "w")?.use { outputStream ->
            outputStream.write(data)
            outputStream.flush()
        }
    } catch (e: Exception) { Log.i(TAG, "[writeToUri] ${e}") }
}