I am trying to post an app that supports messaging to itunesconnect using Xcode. Whenever I try to post the file, I get the error, "Missing app icon. The bundle dosn't contain an iMessage app icon. iMessage app icons must be 148x100 pixels in .png format".
I don't see a place to put in the file. Where should I put it?
The image that you are adding in iMessage should be size as mention in Assets. "missing 148x110 iMessage icon" means you are missed 2x image of imessage icon of ipad pro 74*55 pt because
2*(74*55) == 148*110
You have to add above size image at 2x section of "ipad pro 74*55"
You can change the size of the exist icon by below steps:-
i)Open Preview
ii)Select Adjust size
iii)Enter width & Height 148*110 or according to other required sizes.
iv)Place images to appropriate places in Assets section.
There should be a place in the Asset Catalog to upload a 74x55 icon for the iPad pro. It's in the second row of icons.
Go to Assets.xcassets -> iMessage App Icon Add icon of 148x100 size under 74×55pt.
来源：https://stackoverflow.com/questions/39379692/missing-148x110-imessage-icon