I ran into a problem yesterday when my application was rejected. Apparently the images are not being displayed on the actual Apple Watch, however they are being displayed in
If you're setting the images in your extension code, you should add all the images to the extension target too.
Verify the filenames are correct and the images are placed in the correct target's asset library.
WatchKit Images
It is recommended that you place image resource files in the bundle of your WatchKit app (not in your WatchKit extension’s bundle). Placing them in the WatchKit app bundle lets you use the setImageNamed: method of this class to specify the animated image. Setting them using that method offers better performance by eliminating the need to transfer the images from the user’s iPhone to the Apple Watch. The other methods for setting an image must wirelessly send the UIImage object or image data that you provide to Apple Watch.
Here is the answer. I cannot disclose why I know this, but this is what you need to do.
If you can see the images in the simulator and they are not in your Watch App target and they are in an asset file then they will work for the reviewer.
As of Xcode 6.3, iOS 8.3:
Leave off the ".png" part of the image name. It will look strange in the storyboard, showing a blue "?", instead of the image thumbnail, but will work on both the simulator and watch. Same goes for specifying PNGs for Context Menus and programmatically specifying animation.