Spent hours about this topic (EditButton...)
This was the only solution that worked in my case.
Thank you!
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If you can't "see" your app on the device just goto Xcode > Devices & Simulators > Select your connected device > Installed Apps > Selected your App and remove it (-).
Try installing again.
Awesome! Thank you so much!
"CloudKit integration requires that all attributes be optional, or have a default value set."
If it's not possible anymore to set a default value, the only way for CloudKit would be setting all members to "optional".
Really?