Whether MessageCommunication can transfer file streams (or file objects). If yes, is there a limit on the file size? If not, any other method can used to transfer file?

MIP
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No, there is no way to transfer file stream by MessageCommunication. On the other hand, if you serialize file object then you can do it.

There will be a limit of 10 MB, take care not to implement something that will risk overloading the Event Server.