Journal Entry Event handler not getting applied to excel upload

Hello Upkar,
What version of OneStream are you using?
I presume you are referring to a JournalsEventHandler?

Have you tried putting in LogMessage statements to prove whether the JournalsEventHandler genuinely does/does not execute at all when uploading from Excel?  Could you state what you see in the error log after repeating the tests, after you put a LogMessage statement right at the top of the JournalsEventHandler.

Also , what do you mean by "doing it manually"?  Do you mean that if you upload a journal from Excel and then press the Approve/Submit buttons in the toolbar on the OneStream client, then the eventhandler does trigger.  Could you show the steps you are doing on how to reproduce the issue of the EventHandler not triggering, because it is not clear from the above, in particular the attempt to "submit through Excel".

Contributors on this forum might be able assess the issue and confirm whether it is/is not something that can be resolved or workarounds, but I suspect this may be something that should be raised as a ticket with support, as this is querying some design considerations/design decisions deep inside the platform, and you are unlikely to get a line through to product engineering on this forum.