How to use custom portraits?

[TheMightyDeebo]

So I've been trying to get custom player portraits to work in 2K18 but have had no luck. I've watched both YouTube vids on it so I understand how to do it but saving the file is the issue. I was following the one video with paint.net but when I go to save it as a DDS file it doesn't correctly save. Instead of turning into that blank DDS file it stays as an image and instead of saving as DDS it saves as a paint.net file. I've tried to download that intel file from the other post and rename it as DDS2 but none of it works. Any ideas on how to fix this?