Thanks. I'll give that a try. The (Cancelled) for the memo was something I saw in another post. I'll change it to [Summary] and see what happens.
In the log file I saw this when the cancel url was called.
Date    Func    Detail    Level    Source    AIServer    Camera    Image    Idx    Depth    Color    ThreadID    FromFile    Filename
2/24/2021 12:19:16 PM    CallTriggerURLs             -> cancel URL called: 
, response: 'signal=green profile=3 lock=0 transport=0,0/1 clip=151311539 camera=Front Porch '    Debug    AITOOLS.EXE    192.168.10.55:5000    Front Porch    None    9801    6        70    False    AITool.[2021-02-23].log
But I never seen the word cancelled in 
blueiris, nor do I have any cancelled alerts. So maybe you are correct about the cancel url.