Mendix iFrame - Page not Found

I have created multiple custom .html pages and placed them in /themes in my project. To use these custom pages in my project, I am using iFrame widget, which is placed in a dataview and all the settings are done correctly as I have used this widget previously as well. When I navigate to this page with widget using iFrame, it works fine the first time and displays the page correctly. However, after first time, no link to any of the pages works and gives an error "Page Not Found". Can someone point out what I am doing wrong here or guide me to a different/better solution to achieve this?  Note: I have also tried the same with iFrame tag inside HTML Snippet, and the behaviour is exactly same.
1 answers

For Anyone facing this issue in future. Kindly check this.