Thank you. I can do some coding but, probably won't pursue that path. I've decided to use a built-for-purpose option with a cloud photo storage site and simply provide a link from my Oncord site. A little less elegant but, more robust and doesn't involve bespoke coding.

Besides, I was looking at hundreds of hires photos and I think that would overload the storage capacity of the Oncord plan.

If you have coding experience, you can use the data:repeater component to populate a gallery through a media folder. Otherwise, it's recommended to manually add images to the gallery element for ease.
You may find the instructions in the following guide helpful
Advanced Galleries

If you're adding the code within the event's page, follow these steps:

• Navigate to the event editor and click 'Edit Event.'
• In the Event Description WYSIWYG editor, click the <> icons located at the top right of the editor.
• Scroll to the bottom, where an HTML editor will open, allowing you to add the code that populates images from a media folder.