Why are my iOS devices not syncing wirelessly with my iMac?

Hello and welcome to Apple Support Communities, JazzmanJohn!

I understand you're having trouble with wirelessly syncing your iPhone with your iMac. I'd be happy to provide information that may help you out.

Make sure "Show this [device] when on Wi-Fi" is checked in still while connected via lightning cable, as outlined here:

Sync content between your Mac and iPhone or iPad over Wi-Fi

If the issue continues, let us know if you have the latest updates for both iOS and macOS. If not, use these steps to update:

Update your iPhone, iPad, or iPod touch

How to update the software on your Mac

Have a great day!

I have a similar problem.

iMac - iPhone won´t synk.

iPad works fine.

Tried to reconnect "Show this [device] when on Wi-Fi" (it was already checked), but no change.

All products are updated. It finds the iPhone both wireless and wired, but it does not synk.

The synk process Strats, then stops before it synced, and without any notice it goes directly to check eta memory of the phone as it would after a sync- process.