Impossible de passer de Lightroom à Photoshop

Ah, overlooked the problem, it is visible in your first screen capture, although you need to remember what to look for and then notice it in the a bit hard to view thumbnail badge.

Your selected image is a smart preview with the original missing (external hard drive not connected? NAS not available? Photo gone missing)

LrC needs the original for Edit In.

see:

https://www.phototraces.com/lightroom-tutorials/lightroom-smart-previews/

In Lightroom Classic, bring up the preferences, select the External Editing tab. Please take a screen capture of that and paste into a reply.

Oh, and please use the insert photo button instead of the attachment button to do so.