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Hi Adrian,
Thank you for your reply. If you would like to let the “comment” column get access of the username and timestamp, I think Power App will be more suitable based on my knowledge to Power Apps.
If you tend to make a function to approve the comments that user makes in the “Comment” column which it is a trigger, then Power Automate will be a better choice.
In addition, I also found a similar thread in Power Apps community about adding users full name, timestamp, and appending commentsin document library. You may have a look at your convenience. At meantime, I suggest you can raise a question in Power Apps community if you are interest on Power Apps solution. The experts of Power Apps can give you more professional ideas and solution to achieve it.
Best regards,
Dihao