Hi @Anonymous ,
Do you want to send out the email when a file is created and due date is updated?
Please consider using Do-until loop, so that only when the due date column updated, an email will be sent out.
I have set up the flow likes below for your reference.
After the trigger when a file is created, initialize a String variable first.
Then add a Do until loop, set the do until condition as variable Test is not qual to empty.
Within the loop, add Delay with 1 minute, then Get file properties, select ID from the trigger.
In the action Set variable, select dynamic content DueDate from Get file properties action.
Note: Value used in the Do until condition should be from actions that we’ve added in Do until loop.
Under the loop, add action to send an email.
An image for your reference.

Best regards,
Mabel