private static async Task <int> GetVersionAsync(FilesEventPersistence persistence)
        {
            var existingEvents = await persistence.LoadCommittedEventsAsync(
                ThingyId,
                1,
                CancellationToken.None).ConfigureAwait(false);

            int version = existingEvents.LastOrDefault()?.AggregateSequenceNumber ?? 0;

            return(version);
        }