The 6.7" screenshots are not required so far, as lease there is no announcement yet. And there's no 6.7" screenshots to upload meanwhile you can upload 6.7" screenshots to media content for 6.5" device. The system won't restrict your file for not matching the exact image size. I guess Apple will ask developer to upload 6.7" screenshot some day in the future but not now. And the system is prepared for this.

NWProtocolTCP.Options requires iOS 12+ as a target when compiling in Xcode15 You can increment the minimum deployment version. Or find more details and workarounds here https://github.com/daltoniam/Starscream/issues/983