Hello,
I'm trying to set up a Flow that would be used by multiple people in my team, where they would each update an Excel file with events they would create on their own Outlook, and then the information would be transfered to a consolidated Excel file on a team SharePoint Online site.
My question is the following: does the Flow action "SharePoint: Update File" simply add the new information from each person's file on the consolidated file, or does it overwrite the file with each person's file content? (I fear the second...
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I'm asking because as I want to have a consolidated file, I'll obviously have to create a write-back flow if I want to avoid every team member overwriting the common file 
Thanks for any information that can help!