function allow_html_upload($mimes) {
$mimes['html'] = 'text/html';
return $mimes;
}
add_filter('upload_mimes', 'allow_html_upload');
```
Click **Update File**. Now go back to **Media → Add New** and upload your `agency_prompt_library.html` file.
---
## Step 2 — Get the file URL
After uploading, click on the file in your Media Library. On the right side you'll see the **File URL** — it will look like:
```
https://aiadskill.com/wp-content/uploads/2026/03/agency_prompt_library.html