Where are photo file names?

That is an idea.

I experimented a bit, and with Apple Script we could make it a bit simpler, directly in Photos: This will save the installation of exiftool and the necessity to export the files. This way the lossless workflow will be preserved.

Create an Automator action, that executes an Apple Script to change the titles to the filename, if the title is empty:

The Apple Script:

on run {input, parameters}

tell application "Photos"

activate

set imageSel to (get selection)

if imageSel is {} then

error "Please select an image."

else

repeat with im in imageSel

set title to the name of im

if not (exists (title)) then

set the name of im to the filename of im

end if

end repeat

end if

end tell

return input

end run

Launch Automator, create a new service, and drag a "Run Apple Script" action into the workflow.

Copy and paste the text above into the "Run Apple Script" action to replace the default text in the action.

Save this workflow with a suitable name. It will be installed in the services.

• Now launch Photos and select a few test images.
• Open the "Photos Menu > Services".
• The service should be shown in the menu - I saved my version as "filename2title".
• Select the service to let it run. When you click the selected photos again, the titles should change.

After the Automator action completed: