Apologies, that wasn’t very clear.
Thank you for the video, it might have included what I was missing. error 18 is ERR_FILE_NOTFOUND which I was making me think that it was an issue with the folder directory. Rather it might be you have to enable the Include sub directories option in the Audio Table view:
“FMOD Studio searches recursively through every subfolder from the source directory for all audio files if the “Include sub directories” checkbox is checked. If this checkbox is not checked, FMOD Studio searches the directory itself, but none of its subfolders.” (FMOD Studio | Dialogue and Localization - Audio Tables) this would explain why we are getting the ERR_FILE_NOTFOUND error. Enable that option and let me know if that helps!