First you should check your .ipa file for
unzip yourapp.ipa
If only Payload exists, Apple rejects your application.
You should create the SwiftSupport/iphoneos and place the appropriate fast library files.
You can find out which libraries are needed by checking Payload/yourapp.app/Framesworks . But these library files cannot be used as SwiftSupport/iphoneos .
You must copy the appropriate libraries from your mac /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/iphoneos . The file names are the same as Payload/yourapp.app/Frameworks above, but the content is different.
After you get the Payload and SwiftSupport , put these directories on
$ zip -r yournewapp.ipa Payload SwiftSupport
(Note: delete all .DS_Store files, if they exist)
Then Apple accespt yournewapp.ipa .
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