How do I make Fairmail appear in the share list

I am using an app called Fairmail for my emails on my Samsung S24. I upgraded from S20 a few months ago. On the S20, Fairmail would be one of the options in the share list, for apps such as Whatsapp or Samsung Health. But on the S24, it does not. Fairmail is not on the default apps list on either of the phones. How do I make the Share menu display Fairmail?