I created an app with Swift 5 in Xcode 10 and added the UDIDs of multiple iOS devices to my developer account (got the $99 one).
If I install my app on the device throug
The problem was caused by picking "iOS App Store". Instead, as @DonMag pointed out, you have to use "Ad Hoc" if you want to export an .ipa file that you can drag into iTunes and install on your device - as long as you added the device's UDID to your developer account, of course.
Step 1-3 and 5-7 are the same (as in my question) but for step 4 do this instead: