Hello! The screenshots show that you are using the android version.
If you use HTML export, only an HTML file with links to resources will be created. resources will not be added to html.
If you need html with resources, then try exporting to base64 (but 300 MB is big size)
Android 10 or higher, you will not be able to run html file in the browser on Android due to file access restrictions, try running it from a PC
