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uploadTask.addOnProgressListener { taskSnapshot ->
    val progress = (100.0 * taskSnapshot.bytesTransferred) / taskSnapshot.totalByteCount
    d { "Upload is $progress% done" }
}.addOnPausedListener {
    d { "Upload is paused" }
}.addOnFailureListener {
    d { "failure: ${it.printStackTrace()}" }
}.addOnSuccessListener {
    profilePhotosRef.downloadUrl.addOnSuccessListener {
        d { "downloadUrl: $it" }
    }
}