Hi @diksha_mishra it doesn't make sense is XML Documentation Add-On is an Assets Add-On. However, will post this in the Sites community as well.

I've tried it before and there was no difference. It doesn't work.I tried it again now and still the same.However, the question is, how would it identify if the service is a PreProcessor or PostProcessor if you are registering it as IProcessor?I would assume IPreProcessor would be the right service to register it as (so it can call the preprocess method in all preprocessors).I could be wrong though.

Here you go.The only difference in the code from my original questions vs the service running in my instance is the name of the class. I've renamed it from MyPreProcessor to ACRPreProcessor. The underlying code is exactly the same.A more fundamental question with this issue is, when would the PreProcessor actually get invoked? Would it get invoked when you have an adaptive form which invokes an FDM service? Or is it called during a different scenario? If so, what is the scenario in which the Pre...

I was able to deduce that from the docs.If you look at the sample code that I posted in the original question, the isSupported method returns true always.But the control never reaches the isSupported method.There are no logs that I have printed in that method nor are there any errors in the log file.