Uploading the SDS for hazmat items?!

It’s my first time sending hazmat items to Amazon FBA. I am an approved seller for these items and have all the necessary documentation, but there’s one part of the process I don’t understand…

In the “Dangerous Goods Information - Required Product Information” pop-up, I select “Yes” for “Product Regulation Information” and fill out all the details…

Then it asks me for “Safety Data Sheet (SDS) URL*” I received the SDS files in a .pdf format from the manufacturer, I don’t have a URL.

I have uploaded the documents here: https://sellercentral.amazon.co.uk/gp/fba/material-safety-data-sheet/index.html?language=en_GB&ref=ag_xx_cont_G201749580 but not exactly sure what that achieves.

Any help is much appreciated! Thank you very much