Android Download Manger is not working in removable storage

Question

I am using downloadManager to download large files from server, and I wanted to store these files in my removable storage like SD card or USB(pendrive). My download location is /storage/511B-14E9/Media . I can successfully created the Media folder in my removable storage. But the download files are not saved in this location.

Permissions in Manifest

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

android:requestLegacyExternalStorage="true"

Method to find USB

 fun getUSB(): String? {
        val storageDirectory = File("/storage")
        if (!storageDirectory.exists()) {
            Log.e(
                "ZZZZ",
                "getUSB: '/storage' does not exist on this device"
            )
            return ""
        }
        val files = storageDirectory.listFiles()
        if (files == null) {
            Log.e(
                "ZZZZ",
                "getUSB: Null when requesting directories inside '/storage'"
            )
            return ""
        }
        val possibleUSBStorageMounts: ArrayList<String> = ArrayList()
        for (file in files) {
            val path = file.path
            if (path.contains("emulated") ||
                path.contains("sdcard") ||
                path.contains("self")
            ) {
                Log.d("ZZZZ", "getUSB: Found '$path' - not USB")
            } else {
                possibleUSBStorageMounts.add(path)
            }
        }
        if (possibleUSBStorageMounts.size == 0) {
            setErrorLog(44,"Did not find any possible USB mounts")
            return ""
        }
        if (possibleUSBStorageMounts.size > 1) {
            Log.d(
                "ZZZZ",
                "getUSB: Found multiple possible USB mount points, choosing the first one"
            )
        }
        isUsbFound = possibleUSBStorageMounts.size != 0
        if (PreferenceManager.getDefaultSharedPreferences(this)
                .getString("pref_usb", "") == "" || !possibleUSBStorageMounts.contains(
                PreferenceManager.getDefaultSharedPreferences(this)
                    .getString("pref_usb", "")
            )
        ) {

            PreferenceManager.getDefaultSharedPreferences(this)
                .edit()
                .putString("pref_usb", possibleUSBStorageMounts[0])
                .apply()
        } else if (possibleUSBStorageMounts.size > 1) {
            possibleUSBStorageMounts.forEach { usb ->
                if (usb == PreferenceManager.getDefaultSharedPreferences(this)
                        .getString("pref_usb", "")
                ) {
                    possibleUSBStorageMounts[0] = usb
                }
            }
        }
        return possibleUSBStorageMounts[0]
    }

Method for downloading videos

private fun downloadFromUrl(url : String){

   if (manager == null) {
                manager =
                    getSystemService(Context.DOWNLOAD_SERVICE) as DownloadManager
            }

            if (url != "") {
                val request = DownloadManager.Request(Uri.parse(url))
                request.setDescription("")
                request.setTitle("Download")
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED)

 val path = getUSB() + "/"
                        val dir = File(path, "Media")
                        if (!dir.exists()) {
                            dir.mkdir()
                        }

                        val file = File(dir, url.md5() + ".mp4")
                        val uri = Uri.fromFile(file)
                        request.setDestinationUri(uri)
}

My quest is, is it possible to download files directly to removable storage ? . If yes how it is?

Note : Now I can download files in Mi Android TV, but it is not possible in Sony Bravia Android TV(Access denied, can't write anything to usb).

Thanks in advance.