All -- First, the flow is working just as I want it to --- it is just corrupting the excel files I'm wanting to send in the email.
I've tried files of all these types:

The overall Flow is this:

it analyzes a specific OneDrive Folder every five minutes, if a file is there, it generates an email, attaches that file, and sends it along.
The sent email looks great in Outlook. When I or the addressee tries to open that file -- it reports it as corrupted.
Here is the dynamic portion of the email creation step:

Any advice or alternative methods would be appreciated --- again, the Flow works as I want it, it's just that the excel attachment is always corrupted when sent...
Thank you!
John