I never thought to click on the up-arrow to the right. Just did it now. My choices are:
Export to disk
Export to application
Export to Lightroom (my old version)
Mail
Messages
Airdrop
Notes
Add to Photos
Reminders
I selected “Export to Application” and got a selection window.
I found “select an application”, and it took me to my Applications folder, where I selected “Adobe Lightroom Classic”.
I’ll test this later today, but I think you just solved my problem!! Thank you!!!