I am trying to go to Tools -> Assets -> content fragment configuration
I do not see content fragment configuration in tools -> assets.
I have checked checkbox "content fragment model", "editable templates" for site specific folder.
What is the core components version installed in AEM?
Could you try withcore.wcm.components.extension-1.0.10.zip ?
Release Core Components 2.2.2 · adobe/aem-core-wcm-components · GitHub
In the guide there are no explicit instructions about enabling them, please configure it to 'active' on DAM Structured Content Fragments on OSGI console