You will find a couple of blog posts around deploying HTML forms via Pulsar. This post talks about uploading additional resources the HTML file would use. The recommended method for adding resources to your HTML document is to create a new PulsarSetting:
Then attach a ZIP file (to the PulsarSetting containing the files you wish to use, including the directory structure. Currently, Pulsar supports a single set of HTML resources, so it is recommended that you bundle all resources needed for all HTML documents together in one ZIP. To access the resources from the ZIP file, use the relative path “resources/“ in your HTML, so if you have a file path “images/image2.png” in your ZIP, the HTML should reference “resources/images/image2.png”.