Is there a way to leave notes and comments?
There are multiple ways.
wholeSelect [File]-[Project memo]
It is possible to always display.
You can keep this window always on top. Please use it while doing <save>.
How to leave a note on the timeline
Please refer to the following article for how to leave a memo on the timeline ruler.
How to leave a note on the Fusion node editor
Please refer to the following article for how to leave a note on the node editor.
How to leave notes on clips