that thread you referred to opens a large can of worms which you chose to ignore.
at the very least, webview needs to know where your resources are. i'm guessing you
did not tell it; therefore no images are loaded. assuming you are using <img> tags to
load your images, put your images (and other resources) back in dirassets and use something
similar to the following:
<img src='file:///android_asset/filename.jpg'>
for the images.
it still works in 33 and in this particular, simple case (given my understanding of your post.)
if your use case is more complicated, other remedies may be required.