A+Content for KDP

I am publishing for my first time and creating my author page. I hired 100 Covers, on good recommendations, and have been very pleased with my cover and other content. However, I am struggling to get my A+Content uploaded. KDP modules are preset for sizes that don’t fit the designs I was given, this is so over my head. Where do I go for help? My book releases is 30 days, and I want to have everything ready. There is no support at KDP that I can find….anyone experience anything like this?