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.
I want to put up a large number of photos from an event for event attendees to be able to view and download.
Creating the gallery template is straight forward but, is there a better way to load the images than one-by-one using Image/Edit?
All the photos are loaded into a subdirectory of media.
An alternative is to embed a cloud photo gallery into a web page on the Oncord web site. Is there a recommended way to do that?