Where did my file saved into External Storage in Emulator?

Question

I can write to Emulator Internal Storage

        context.openFileOutput(fileName, Context.MODE_PRIVATE).use {
            it.write(outputMode.toByteArray())
        }

Or write to Emulator Internal Storage

            val file = File(context.filesDir, fileName)
            parseFrom(FileInputStream(file))

This works fine.

I can find the file in ./data/data/mypackagename/files/ using Device File Explorer in Android Studio as shown below

However when I save them in External Storage

using

        val path = context.getExternalFilesDir(null)
        val letDirectory = File(path, folder)
        letDirectory.mkdirs()
        val file = File(letDirectory, fileName)

        FileOutputStream(file).use {
            it.write(outputMode.toByteArray())
        }

I can still read it using

            val path = context.getExternalFilesDir(null)
            val letDirectory = File(path, folder)
            letDirectory.mkdirs()
            val file = File(letDirectory, fileName)
            parseFrom(FileInputStream(file))

But I cannot find it in my Device File Explorer folder. I cannot find it in ./sdcard folder nor ./mnt/sdcard folder.

Where is it stored?

Note : This is on Android 11, where I use <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>