Product Tag File- This is used for assigning a Tag to a product.

From the import type dropdown select Product Tag.

1BDB498A-BAE9-4BF7-9908-B6701CD6B344

You can see the required format by choosing this button

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

FE4592BE-9C2F-4C58-8CE1-42A316EC8D4A