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I am able to reproduce this issue. I will need some information from your side for escalating this to engineering. Can you please send us following screenshots from the browser's 'Developer Tools' when you click on "Import" button?
After selecting or dragging file at the Users Section => Setting => Import The import button does not work when you click on it nothing happens!
Screenshot - https://i.imgur.com/EOWaadK.png
The file that I am trying to import is 2KB and is JSON.
The KID of the application - kid_H1resG6sf (SeenIt)