Classic Knowledge article types are replaced by record types in Lightning Knowledge. Note the following configuration differences to enable 'Send Article Content' via email.
To enable sending article content via email in Lightning Knowledge, configure a Communication Channel Mapping for each Knowledge record type you want to share via email. This links the article record type to the Email channel so agents can insert article content into case email responses.
Set Up Actions to Insert Articles into Channels in Lightning Knowledge
Insert Article into Email not available in Lightning Knowledge component
Compare Salesforce Knowledge in Salesforce Classic and Lightning Experience.
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