May I know which index.html are you referring to? Also it’s weird that renaming to index_1.html makes it working. Maybe you can investigate and see how the renamed file is loaded.
We are trying to load static asset into our s3 bucket and try to access from the same. We have even updated the configorigin.txt in UI folder. But our instance is still undefined. We even following PDFTron Systems Inc. | Documentation but we are unable to succeed.
What we need to do with config file. Can we get some support via chat or sample app to explore your product.