HI. Took the graphene plunge about a week ago.

I have no idea if this is Graphene or a general android question.

I decided to copy a bonestock-html webpage I had put together onto my phone, so that I could access it offline. I put the whole thing into Documents, and I can open the index.html file in Vanadium.

The problem is no other page works (the main page has links to other pages also stored on the device). Normally one can just use regular paths to other pages, and it works, but not here; it can't find any page other than the one you first opened. I even tried opening one of the linked-to pages in vandadium; that works fine, but then you can't follow any links on that.

This also applies to images reference in the web page; none of them render even though they are in the right relative location on the device.

Anyone have any idea what I did wrong?

Try opening it was another browser (Brave, Chrome, Firefox, etc). If it behaves how you expect in another browser than you have isolated it to being an issue with Vanadium, if it doesn't then it is much more likely to be OS related.

And welcome to the only good smartphone OS around ;)