Как удалить 1-3 фото из Firebase Storage по URL из Firebase Realtime Database?

Загружаю 1-3 картинки в Firebase Storage

private fun uploadImages() {
        if (imageIndex == 3) {
            dbManager.publishAd(ad!!, onPublishFinish())
            return
        }
        val oldUrl = getUrlFromAd()
        if (imageAdapter.mainArray.size > imageIndex) {

            val byteArray = prepareImageByteArray(imageAdapter.mainArray[imageIndex])
            if(oldUrl.startsWith("http")){
                updateImage(byteArray, oldUrl){
                    nextImage(it.result.toString())
                }
            } else {
                uploadImage(byteArray) {
                    //dbManager.publishAd(ad!!, onPublishFinish())
                    nextImage(it.result.toString())
                }
            }


        } else {
            if (oldUrl.startsWith("http")) {
                deleteImageByUrl(oldUrl) {
                    nextImage("empty")
                }
            } else {
                nextImage("empty")
            }
        }
    }

    private fun nextImage(uri: String){
        setImageUriToAd(uri)
        imageIndex++
        uploadImages()
    }
    private fun setImageUriToAd(uri: String){
        when(imageIndex){
            0 -> ad = ad?.copy(mainImage = uri)
            1 -> ad = ad?.copy(image2 = uri)
            2 -> ad = ad?.copy(image3 = uri)
        }
    }
    private fun getUrlFromAd(): String{
        return listOf(ad?.mainImage!!, ad?.image2!!, ad?.image3!!)[imageIndex]
    }
    private fun prepareImageByteArray(bitMap: Bitmap): ByteArray{
        val outStream = ByteArrayOutputStream()
        bitMap.compress(Bitmap.CompressFormat.JPEG, 20, outStream)
        return outStream.toByteArray()
    }
    private fun uploadImage(byteArray: ByteArray, listener: OnCompleteListener<Uri>){
        val imStorageRef = dbManager.dbStorage
            .child(dbManager.auth.uid!!)
            .child("image_${System.currentTimeMillis()}")
        val upTask = imStorageRef.putBytes(byteArray)
        upTask.continueWithTask {
                task -> imStorageRef.downloadUrl
        }.addOnCompleteListener(listener)
    }

    private fun deleteImageByUrl(oldUrl: String, listener: OnCompleteListener<Void>){
        dbManager.dbStorage.storage
            .getReferenceFromUrl(oldUrl)
            .delete().addOnCompleteListener(listener)
    }


    private fun updateImage(byteArray: ByteArray, url: String, listener: OnCompleteListener<Uri>){
        val imStorageRef = dbManager.dbStorage.storage.getReferenceFromUrl(url)
        val upTask = imStorageRef.putBytes(byteArray)
        upTask.continueWithTask{
                task-> imStorageRef.downloadUrl
        }.addOnCompleteListener(listener)
    }

При нажатии кнопки "удалить объявление", мне нужно взять URL этих записей из базы Firebase Realtime Database по uid и удалить Firebase Storage по пути main/uid/"image_${System.currentTimeMillis()}"

Код кнопки удалить объявление:

fun deleteAd(ad: Ad, listener: FinishWorkListener){
        if(ad.key == null || ad.uid == null) return
        db.child(ad.key).child(ad.uid).removeValue().addOnCompleteListener {
            if(it.isSuccessful) listener.onFinish(true)
        }
        delFromFavs(ad, listener)
        delFromFilter(ad, listener)
        delFromInfo(ad, listener)
    }