Reading

let url = "https://path-to-media"
guard let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first,
      let searchQuery = url.absoluteString.components(separatedBy: "/").last else {
  return nil
}

do {
  let directoryContents = try FileManager.default.contentsOfDirectory(at: documentsUrl, includingPropertiesForKeys: nil, options: [])
  let cachedFiles = directoryContents.filter { $0.absoluteString.contains(searchQuery) }
  
  // do something with the files found by the url
} catch {
  // Could not find any files
}