User blog comment:X-Machinist-X/Dishonored random stuff/@comment-26438896-20151030165752/@comment-6301921-20151030202427

Just fyi - I don't know if you're already aware of this or not. Just ignore me if you are. It looks like you've figured most of this out.

If you accidentally upload the same thing twice, you can either mark it for deletion using the template or use "upload a new version of this file" on the image's file history tab to add a new image.

For categories, usually you'll end up adding a picture either to a character's category (Corvo Attano/images) or a mission category (Lady Boyle's Last Party/screenshots). There are also other categories for posters, concept art, and other things like that.

Remember to add a period to the end of your picture captions when you add them to an article, and make sure your screenshot is unique and not just a reiteration one of the existing screenshots. You can find the other rules on posting images in the Manual of Style.