I figured it out. I’m not sure what was the issue, but my suspicion is some kind of weird folder ownership issue.
Originally I created the data/external_converters folder with the file editor addon. It was not working.
I saw a post on github that you should do it via CLI. So I deleted the folder via CLI first, then re-created it via the command line and it worked.
Weird, but thats linux if you are noob…