Resubmitted iOS App fails to upload be cause it is missing 64-bit support
If the iTunes Store is suddenly rejecting your App because it lacks 64-bit support it is likely that you created
an archive while you have a 32-bit device (like an iPod Touch) attached to your computer. This is common if
you use a physical iOS device for debugging purposes.
Unplug all devices, re-archive, and try uploading again. Otherwise check out this SO thread:
http://stackoverflow.com/questions/28312779/why-the-missing-64-bit-support-happened-when-upload-to-the-itunes-connect
See also