Hi @Airman,
Thanks for feedback.
You said that you get duplicate emails when the file is modified online. It would be the cause. When a file is modified online, it would be autosaved every 5 to 10 minutes, so the flow would be triggered each time the file is autosaved.
I have made a test. It seems that when I modify the file online within a very short time, it will only trigger once. However, if I open the file for several minutes then save it, the flow will be triggered twice or more.
A workaround for this issue is to use the trigger When a file is created, and modify the file on local then load the file to your cloud storage account.
Hope it could be your reference.
Best regards,
Mabel Mao