public async Task <string> UpdateThumbnail(int id, string base64Thumbnail) { var itemE = await Repository.GetAsync(id) ?? throw new EntityNotFoundException(); var fileName = await ItemPictureManager.SaveThumbnailAsync(base64Thumbnail); // await ItemPictureManager.DeleteAsync(itemE.ItemThumbnail); itemE.ItemThumbnail = fileName; await Repository.UpdateAsync(itemE); return(fileName); }