Want to use sitemap selector or file selector on a HTML block?
This is what you're looking for.
Usage
"Page Link" button
Use this button if you'd like to insert a link of a page.
It inserts a placeholder like CCM:CID_123, this placeholder will replaced a link to a page when rendered the page. CID_123 means page id 123.
"File Inline Link" button
Use this button if you'd like to insert a full path of a file.
It inserts a placeholder like CCM:FID_123, this placeholder will replaced a download link of a file when rendered the page. FID_123 means file id 123.
"File Download Link" button
Use this button if you'd like to insert a download link of a file.
"Base URL" button
Use this button if you'd like to insert an application url.