How to download a file using download manger and save it to the internal storage of the app (i.e. fileDir)

I tried the below way but when I fetched all the files in requireContext().filesDir. Download file was not present there.

setDestinationInExternalFilesDir(context, context.filesDir.absolutePath,
                  fileName)

I also tried using setDestinationUri() it created the below crash.

Here is how I did it then, first of all download manager doesn't allow to download files directly into the private storage of the app.

so I had to use okhttp to do the same thing and it worked fine.

/**
 * Method to download the file in to the private storage of app,
 * this method won't show any downloading notification neither any toast message on
 * download start and download complete.
 */
private fun downloadFileInInternalStorage(link: String, fileName: String) {
    val mFileName = fileName.replace(" ", "_")
        .replace(Pattern.compile("[.][.]+").toRegex(), ".")

    val request = Request.Builder()
        .url(link)
        .build()
    val client = OkHttpClient.Builder()
        .build()

    client.newCall(request).enqueue(object: Callback {
        override fun onResponse(call: Call, response: Response) {
            val fileData = response.body?.byteStream()
            if (fileData != null) {
                try {
                    context.openFileOutput(mFileName, Context.MODE_PRIVATE).use { output ->
                        output.write(fileData.readBytes())
                    }
                } catch (e: IOException) {
                    e.printStackTrace()
                }
            }
        }

        override fun onFailure(call: Call, e: IOException) {
            e.printStackTrace()
        }
    })
}