In the screenshot below, the Email activity can not see the Find Entry activity above it, so there is no way to attach the entry we found.
It also does not list Find Entries or Search Repository activity tokens. This leaves us no options for attaching anything to an email.
The only token we could get it to list was Download Electronic Document which throws an error stating that no electronic document component exists for the entry, which is expected. Download Electronic Document was meant for other purposes so not sure why this is the only token we can see.