Special Price File- This updates special offers applied to products

From the import type dropdown select Special Price File.

7DA22827-9DE1-4653-9168-27C618091ECA

You can see the required format by choosing this button

246746A3-7B7A-465A-BF9E-6DD1092F3285

E2B9A093-DA83-40D3-BA52-9CC3079FD224