I rename my files when I import them into Lightroom - ie WBH01012022_51_1234. This custom name is my initials shoot date camera file name. Then when I edit the file in photoshop I have the preference setup to add the letter "a" at the end to show that this file has been altered. the problem is that now when I set the preference for external editing renaming the name shows up as WBH01012022WBH01012022_51_1234a. Somehow I get the custom text and date from the original file naming added back to the new name. Can someone explain how to get it to just add an "a" to my "original name".
Please post a copy of the file rename template, and show your external editor settings in the Lightroom preferences. It seems you use (part of) the file name twice in the template that you use to add the "a".