So, I think there is a work around that you could use, however, it's not as clean as I would like however, providing that you use Outlook Desktop App, it should work. (I haven't tried this so don't hold it against me if it doesn't).
It is utilising Quick Steps, set up a quick step so that it forwards the email to yourself and change the subject to something that you wouldn't receive normally i.e. "Application Form Forwarding Email to automatically save in OneDrive" or whatever you think is appropriate.
Then set up the automation based on when a new email is received, updating the advance settings to only work when the email is received from you and with that specific subject.
It has some manual intervention but I can't think how else to get around it
Sorry, just to add, you will need to click this quick step on the email when you receive it initially so that it automatically forwards it to you with the given subject
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