Cookies, local storage and temporary browser state are different
A cookie is a small value associated with a website and sent or made available according to browser rules. Local storage and similar browser storage mechanisms can retain site data without being sent with every request. Temporary in-memory state, object URLs and file handles can exist only for the current page session. These mechanisms have different purposes even though people often refer to all of them casually as “cookies.”
NEXDOWNLOAD tool workflows can use temporary browser state to remember a selected file or setting while a page is open. That does not automatically mean the source-file contents are written into a persistent tracking cookie. Browser developer tools can show which cookies and storage keys exist for a site when a visitor wants to inspect them directly.