I had both of these problems when I created the WatchKit app.
(1) For your first problem: warning: skip the copy strip phase.
I found solutions here:
Warning during archive. App with iOS 8 extension in Xcode 6
and here:
Xcode 6 Archiving and receiving the warning “Skip phase copy bandwidth, code with binary code” when adding a “sharing extension” for targeting
In particular, here are the steps I used to fix the problem:
Launch Xcode and open your project.
Select the blue project icon in the upper left corner.
In the second column, which contains the sections: PROJECT and TARGETS, select the primary target in the TARGETS section.
Select the "Build Settings" tab.
Scroll down to the Deployment section.
Locate and expand the section called "Debug Debugging Symbols While Copying"
Find the line called "Release".
Change the value from Yes to No.

(2) For your second problem: Failed to find or create the corresponding signature assets. The solutions are here:
No training profiles for WatchKit extension found when sending to App Store
and here:
Submit WatchKit Provisioning Error
I had to update the Provisioning Profile "Distribution" profile, which I used to send my entire application before I turned on the WatchKit extension. In particular, these steps fixed my problem:
I went to developer.apple.com by selecting "Certificates, identifiers, and profiles."
- On the Identity and Profile Identifiers page> Profile Profiling page, click the Application Store profile.
- Click "Edit."
- Click Create
Alex D Apr 10 '15 at 14:09 2015-04-10 14:09
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