Hi @Chris-Spm,
Could you please share a screenshot of your flow's configuration?
If you want to achieve your needs within one single flow, I afraid that there is no way to achieve your needs in Microsoft Flow currently.
You could consider take a try to create two separated flows to achieve your needs. The first flow is used to store the modification information of files in your specific folder, you could store these modification information in a Excel file stored in your OneDrive folder. The Second flow is used to send Email notification about the modification information per day.
I have made a test on my side and create a Excel file (ModificationInformation.xlsx) to store the modification information (The Excel file is stored in my OneDrive folder), the data structure of it as below:
Please take a try with the following workaround:
First Flow:
The flow works successfully as below:
Second Flow:


Note: Within "Create HTML table" action, set Include Headers to Yes and set Columns to Custom, type the entries as above. In addition, Within Body field of "Send an email" action, type Output dynamic content of "Create HTML table" action, Is HTML set to Yes.
The flow works successfully as below:

Best regards,
Kris