Получение всех сторэйджс(мой способ):

static File[] ContextCompat.getExternalFilesDirs(@NonNull Context context, @Nullable String type)

data class StorageInfo(val path: String, val name: String, val number: Int)

fun getStorageList(context: Context): List<StorageInfo> {
   val list = mutableListOf<StorageInfo>()
   ContextCompat.getExternalFilesDirs(context, null)
       .forEachIndexed { index, file ->
           val path = processStorage(context, file)
           val name = path.substringAfterLast('/')
           list.add(StorageInfo(path, name, index + 1))
       }

   return list
}

private fun processStorage(context: Context, file: File): String {
   return file.path.replace("/Android/data/" + context.packageName + "/files", "")
}