What does the "Save X Reviews" button at the bottom of the study page do?

I noticed at the bottom of the study page, there are two little buttons, and the one on the right seems to give some sort of server information if you hover over it, but I’m unsure what the one on the left is for. Why is there a “Save X Reviews” button? Does it save me from doing reviews, or does it save my review progress? Should I ever need to click it?

The server doesn’t save your reviews after each individual review, but rather saves them in batch after you complete a few. The only time you should need to press that button is if you’re going to leave the page and it says there are reviews to save. If you don’t see that button it’s safe to assume everything is saved.

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