I stumbled upon this as I ran into the same problem. This is the first time I have been instructed to handle the release of the Swift app on the App Store.
I found this TALAA answer works: fooobar.com/questions/16240 / ...
In the build settings there is a parameter "Embedded content with hidden code", which must be installed in YES. After that, clean the project before building it.
After cleaning, you will have to recreate the assembly for download on the App Store. You may find that a new download will be rejected, claiming that a binary already exists for this number. If you update the build number (must be greater than the previous one), then the new download will be accepted.
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