I have a project with over 700 pop-ups. Originally it was going to be local only on ipads in our exhibit gallery. Now with covid, we want to host it on our website so that if people want to not touch the screens they can use their own phones. The problem is I didn't plan for accessibility. So what is the best way to add alt text? I made the pop-ups by placing InDesign pages from another file into five separate files based on their category. Should I put the alt text with the pop-up info file in the original placed file or in the key files where the pop-ups are programmed? Or is this something that should be added in after the fact in the html? (This question is probably as clear as mud, sorry). An example of the web app can be found here for now jessdavenport.com/vmnhbutterflies/index.html
Any help is greatly appreciated.