Q: Mac Pro notes does not sync with iPhone and iPad

Hello there, tdawkins.

It sounds like you are unable to sync your iOS devices to your Mac Pro after updating to Mac OS X El Capitan. The following Knowledge Base article offers up some great steps for troubleshooting a device not being recognized:

If you don't see your connected device in iTunes for Mac - Apple Support

See where to find your connected device in iTunes.

{...}

Make sure that your device is on

Also make sure that you can get to the Home screen.

Get help if you have one of these issues:

• Your iOS device won't respond or turn on.
• Your iPod won't turn on.
• You forgot your passcode or your device is disabled.

Make sure that your Mac supports your device

See the system requirements for iPhone, iPad, or iPod.

Check your USB connections

1. Unplug other USB devices from your Mac and try again.
2. Try a different USB port.
3. Try a different USB cable. 

Learn more about using USB cables with your Mac.

Make sure that your device trusts the computer

You might get an alert if you haven't connected your iOS device to this computer before. Unlock your device and tap Trust. 

Learn more about the Trust This Computer alert.

Restart your device

Restart your iOS device or reset your iPod.

Restart your Mac

Turn your Mac off and back on.

Update your software

1. Check for software updates on your Mac.
2. Check for an iTunes update.

Check your security software

If you have security software installed, learn how to resolve issues between iTunes and your security software.

Get more help

If you still don't see your device in iTunes, contact Apple Support.

Thanks for reaching out to Apple Support Communities.

Cheers.