Custom HTML in Page

I am running a custom HTML form in one of the WordPress pages. I used the Allow HTML Snippets plugin to create a shortcode.

Using the shortcode, the HTML form shows up just fine. However, it also has a “submit” button that won’t work. Every time I click it, I receive a “file-not-found” message.

The custome HTML form works fine outside of WordPress. I have copied the Form’s PHP file that processes the input to 1) the plugin’s file folder, 2) WP’s main directory 3) about 10 other places I thought it might be looking.

The only other solution I can come up with include

– including the PHP file within the HTML file, so it can call itself.

I still receive the “file not found” message. If anyone can help, I would greatly appreciate it.

The problem seems to be with WordPress as it will not work with any Template. Again, the html form and php files work fine outside of WordPress.

Thanks in advance.