Impossible to copy paste from one project to another

Hello,
I just want to copy some recordings from one project and paste them in tracks in another project…

For some unknown reason, I can’t… ctrl C/ctrl V; drag and drop, nothing work
Even one recording at a time is impossible.
I read that I must copy from an active porject to an inactive project, but it don’t help. Nothing happen.
What can I miss ?

Thanks in advance