Paper 3 no linkable item

Hello everybody,
I am a new user of Hook.
I would like to use it with Papers 3.4: I read the app is listed in the linkable app (and read in the forum many of you are using both the apps).

But (there is a but, of course) when I evoke Hook the app return a "no linkable item found in Paper 3.4)

Any suggestion?

Thank you,

Does anything here help: No Linkable Item in … – Hook?