My iPad has quit updating text messages

If you have an iPhone - and both iPad and iPhone are signed-in to iCloud with the same AppleID - to send SMS/MMS messages (green bubbles) from your iPad you must explicitly enable Text Message Forwarding for your iPad on your iPhone...

On your iPhone:

Settings > Messages > Text Message Forwarding - set to ON - and explicitly enable your iPad from the list of devices.

Also ensure that Messages in iCloud is enabled on both your iPhone and iPad:

Settings > [Your Name / AppleID] > Messages - set to ON

lanora64 wrote:

I have tried syncing my iPhone to my iPad and the last message on iPad is 8/7. Instructions from the internet do not follow what I have available on my iPhone or iPad.

And what instructions is that you found on the internet?