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.

Same problem here. 2TB Transcend external storage mounted in NextCloud docker container showing green dot, but I’m not allowed to write to it.