//Methods for Image Upload
public static async Task <List <string> > GetCaptionAsync(Activity activity, ConnectorClient connector, string subscriptionKey, string uriEndPoint)
{
var imageAttachment = activity.Attachments?.FirstOrDefault(a => a.ContentType.Contains("image"));
if (imageAttachment != null)
{
//if serviceUrl doesn't show in filename
var localFileName = imageAttachment.ContentUrl.Replace("[object Promise]", activity.ServiceUrl);
using (var stream = await GetImageStream(connector, localFileName))
{
return(await OCRService.MakeAnalysisWithImage(stream, subscriptionKey, uriEndPoint));
}
}
// If we reach here then the activity is neither an image attachment nor an image URL.
throw new ArgumentException("The activity doesn't contain a valid image attachment or an image URL.");
}