Several things:
could you please post in the forum section that is appropriate?
i do not think that the original choice "development/export" has anything to do with renaming folders.
Then, if you have text parts with special characters, please follow
If you need support using Mp3tag, you can help the community members that are about to support you in finding a solution or workaround to your problem, by following these simple guidelines.
Be descriptive, also in what you’ve already tried
Please give a short explanation what’s not working as expected or what you’re trying to achieve. It’s best to know any details about the problem at hand and especially, what steps you’ve already tried to solve it by yourself. Helpful information also includ…
esp. the part about the formatting .
And then there is the search function and I found with the keywords "folder name extension" this thread:
The files would not be duplicates as they would have different extensions.
I would filter for MP3 files,
rename their folder so that the FLAC files and MP3 files end up in the same folder.
Now filter for flac files and rename the folder again so that all files in the folder are moved to the new folder, e.g. d:\my music\ALBUMARTIST\YEAR - ALBUM_allfiles
This should leave all folders untouched that contain only MP3 files.
Now filter for the MP3 files again where
NOT %_DIRECTORY% HAS FLAC AN…
which features more or less the idea: