I am searching notes on thw topic for Write back functionality in Qlik Sense and found many useful videos but I have a few doubts as in:-
1. Where these comments gets stored?
2. If I have entered a comment for today and wish to see it tomorrow and then add a new comment - what happens to yesterday's, today's, tomorrow's comment? will they get overwrite 1 by one or save all 3?
As Rnt said the answer to that questions will depend on the tool you are using to achieve it. If you are still looking for tools to writeback in Qlik Sense you can take a look at LLodi Suite, and I will gladly help you in any question that may arise.
It only use native Qlik functionality and APIs and hence, it can be installed right away without the involvement of IT. All your comments are stored to QVDs so there is no need for external services or databases.