Your comments
My issue (not an issue with your design, but the problem I was having) is the following. I thought I was creating shortcuts to app folders with the ‘Add External Folder” menu item. It’s when I navigate to one of my apps by clicking on that apps “External Folder” (see “relativeTest External: iCloud Drive” in the photo I sent) that the relative addressing doesn’t work. I suppose I shouldn’t be creating external folders as shortcuts to apps, as that breaks something.
I do have an external folder setup as Textastic in the app (see the screenshot I sent earlier), and if I navigate to relativeTest from there, it works fine! It doesn’t work if I navigate to to it from the relativeTest folder (also in the previous screenshot). I guess I’m confused about the function/use of “external folders”
I have a folder in iCloud labeled Textastic. That’s where the relative and RelativeTest folders are located.
it’s is interesting to note that when I press the iCloud tab under Local Files in your app the result is empty. Maybe I don’t understand what’s meant by add external folder in the app.
I sent support a very simplified version that exhibits the issue on my end.
I moved the folders using relative file addresses to the local files , and it worked. The same folders on iCloud don't work.
It seems like it's something to do with iCloud.
The first screenshot is of the html file that is in a folder where all its referenced files are located. I copied that html file to another folder (second screen shot) which is at the same level the original html file is in. Then I changed the references to the src files using indirect addressing. When I try to run new html file I get LineChart not found. That’s the first line in the embedded script, and LineChart is defined in ChartClass/script.js

Folder and file names are all good but still doesn’twork… I am storing all my folders/files on iCloud Drive. I’ll duplicate the file structure on my iPad, and see if that makes a difference. Not sure if the path needs to somehow reference iCloud Drive.
Sweet, I’ll double check my code
Customer support service by UserEcho
sounds good, thanks.
BTW, I love the app. Keep up the good work, it gives this old retired EE a platform to help keep the grey matter working.