The voice command to play next episode in Up Next should support user files.

The code hasn't been implemented to play the next episode in the Up Next from a voice command if the episode is a user's file.

**PlaybackService.kt**
```
private fun performSearch(searchTerm: String): List {
val searchResults = mutableListOf()

val query = searchTerm.trim { it <= ' ' }.lowercase()
if (query.startsWith("up next") || query.startsWith("next episode") || query.startsWith("next podcast")) {
val upNextEpisodes = playbackManager.upNextQueue.queueEpisodes.take(10)
for (episode in upNextEpisodes) {
if (episode is Episode) {
podcastManager.findPodcastByUuid(episode.podcastUuid)?.let { parentPodcast ->
addToResultsIfNotExists(AutoConverter.convertEpisodeToMediaItem(context = this, episode = episode, parentPodcast = parentPodcast), searchResults)
}
} else {
// TODO: UserEpisode
}
}

return searchResults
}
```

Start in PlaybackService.kt at performSearch and trace how Up Next episodes are converted into search results. Inspect the TODO branch for UserEpisode and the surrounding queue handling, then verify that a voice search for “up next” returns user-file episodes as well as regular episodes.

Written by the indexing model from the issue text.