With Catalina I can no longer sync photos to my iPhone. Why??????

You can still sync your Mac and iPhone via USB.

see > Use the Finder to sync your iPhone, iPad, or iPod with your computer - Apple Support

For specific instructions on manually syncing photos.

see > Sync photos between your Mac and iPhone or iPad - Apple Support

Note: When iCloud Photos is turned on, no photo syncing options appear when you select Photos in the button bar.

See the part about "iCloud and the System Photo Library" here: https://support.apple.com/en-us/HT204414

Have your guys/gals seen this read: https://support.apple.com/guide/photos/change-photos-preferences-pht5156cc968/5.0/mac/10.15 In particular, check the small print at "Importing." Is this new to Catalina. I can't say since I don't use Photos.

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How about asking your question on the iCloud on my Mac community support forum? I haven't seen a disproportionate number have problems with Photo syncing and Catalina. Go here: https://discussions.apple.com/community/icloud/icloud_on_my_mac

Catalina doesn't sync the photos you ask it to, I and many others have the same problem and Apple aren't doing anything about it.

I'm sure they just want people to pay for their cloud services.

I agree with Rodgermc75, this makes compatibility between my devices defunct and my Apple devices are just useless paperweights.

That sounds like you're using the cloud, I don't want to use the cloud. I want to be able to transfer photos directly from my laptop to my phone.......... Like we've been doing for years.

Thanks for your reply, maybe I'll attach my phone and leave it attached for a couple of hours to see if mine gets its lazy ar$e into action.

Thanks for your replies, Donv. The problem is with syncing the iPhone, Catalina refuses to add the selected photo albums even though they are ticked.

There are quite a few cases on the Internet.

You are very welcome. And, ouch!!!