File size limit CMS 12

We want to import multiple websites/media folders into one CMS instance, and have increased the max filesize using the appsettings:

"CmsUI": {"Upload": {"FileSizeLimit": 10737418240
      },

And using:

            services.Configure<FormOptions>(x =>
            {
                x.MultipartBodyLengthLimit = 10737418240;
            });

This seems to work for our local development environment, but when trying to do the same in DXP, we still get a 'Timed out, or max file size exceeded' error after about a minute. The file were trying to upload is around 1gb.

Theres this bug: https://world.optimizely.com/support/bug-list/bug/CMS-24180. But its stated this has been fixed in 12.10.0. We are using 12.13.1.

Are there any settings we missed that make it work in DXP?