Hook 1.6 , released a few minutes ago, includes a core change of Copy Link RTF handling which according to our tests solves the issue of Hook links pasted into Mellel docs. (One might notice a Hook RTF-related change attributed with gratitude to the devs of Nisus in those release notes. but fyi not related to this.)
the Copy Link issue is not related to the “No linkable item found in” issue which some people are experiencing with Hook. I updated our ‘linkable apps’ page on 27th to reflect the issue.