re: "so when you submit the work and then they need something changed, where do you send those changed files? In a message?"
You can send changes in a message.
But be sure to ALSO USE THE SAME TOOL.
Go back to the same place, and use the green tool to RE-Submit Work / Request Payment.
Because that button will once again start the 14-day countdown clock.
When the client officially uses the button on their end to request changes, it STOPS the clock. So you need to use the button you YOUR end to start the clock again.
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