External Storage Issues

I apologize in advance as I’m sure this topic has been covered, but I haven’t been able to find a workable solution.

I’m new to Nextcloud. I configured my instance using the Nextcloud image via docker-compose. I’m attempting to use external storage (exfat) attached to the server running the Nextcloud container. I’ve successfully connected the external drive via the “External Storage” setting within Nextcloud.

However, whenever I try to create a folder or file, I get an error that says it couldn’t be created. I’m guessing this is a permissions issue, but I’m not sure how to fix it.