Error uploading an HTML file to GPT BUilder

I’m using GPT Builder for the first time and think it’s a fascinating new way to think about development. I’m uploading some custom files as part of this, and they all uploaded fine - except for one HTML file. I’d add a link to the source page but this won’t let me include links in the post. :slight_smile:

I saved the web page locally as openingrolls.html. The HTML seems pretty benign - it’s a page that shows information about backgammon moves.

When I try to upload that file to GPT Builder, I get an error “Unable to upload openingrolls.html”. I asked the GPT Builder chatbot about it, but it didn’t seem to know any more information. I don’t know what the actual underlying error is.

Does anyone know how I might find out the root cause here?