function useFetchAndDecryptMedia() {
  const identityContext = React.useContext(IdentityClientContext);
  ...
  return React.useCallback((
        blobURI,
        encryptionKey
  ) => {
    const authMedatata = await getAuthMetadata();
    return fetchAndDecryptMedia(
        blobURI,
        encryptionKey,
        authMedatata,
      );
  }
}