I am working on Xamarin.ios and using visual studio for development. I have added LaunchScreen.Storyboard for displaying launch image as i want to target new iPhoneX device
I have found a solution for this.
having had the same problem I was finally able to select my Image set in the drop down by making sure the Media.xcassets folder was included in the solution. By default it is not induced.
Once this was done a clean and rebuild allowed me to select the SplashImage Asset set in the drop down under the Image View properties.
I was also having the same issue today I have updated visual studio for mac with the latest version 7.4(build 1033).I am able to add the image to assets.xcassets now its working for me.