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I'll help generate a report showing the modified dates, @jknightcs2.
You can run the Transaction Detail by Account report and then customize it to see the modified date for each transaction. I can share the needed steps to achieve this.
To save a copy of the said report, you can memorize it. This way, you can access it anytime for future use.
You can count on me if you have some follow-up questions about managing your reports in QuickBooks Online. I'd be happy to help you some more.