You're unable to import review in bulk from Dser because the button "Import Ali Reviews" does not work. The main reason is because you are logging many stores on one Dser's account (image below), so our app cannot detect which stores need to be imported review. This is a known issue and our Dev team is finding the relevant solution to improve it in the next releases, please stay tuned!

As an alternative solution, please consider to install Ali Orders and it will help you bulk import review like Dser, for more details can be found here

Hope this might be helpful for you
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