I want is to include iPhoto's captioning feature in Photo

With Photos you can manually add captions to each slide by selecting the slide and clicking on the "+" button at the far right of the slide tray and entering the text in the box that comes up:

You can change the color of the text by selecting it and using the Edit ➙ Font ➙ Show Colors menu option.

Select the color and close the color window.

Nobody here has the capability to add features to Photos. We do not work for Apple. (The few who do are moderators, not developers.)

If you want to tell Apple about a feature you want, use their formal feedback submission pages at Product Feedback - Apple

As mentioned above, I'm looking for allies to pressure Apple to restore/add a very useful function to Photo.

Polls and petitions are not allowed here in Apple's forums. It is against the Terms of use, but I second your request. It is a lot of wasted work and error prone to have to copy and paste all titles manually to title slides.

My work-around is to use an Apple Script that will send a message with the title of the photo, the. date, and the location to the Notification Center, whenever a new slide is shown, see: Script: A Slideshow With Titles and Locations and Dates in Photos

You could try to write a similar script and modify it according to your needs.

For the time being you could export the photos from Photos and create your slideshow as an iPhoto project,

GuyRowley wrote:

Wow! Thanks for the suggestion. Although it would be more useful if I were a higher level user. I think I need a grandkid.

How right you are!

😊