Right. It current is set to default “./data”. Previously, I had it set as the /mnt/mm/data and tested by uploading an image I had on my desktop. And I found a /mnt/mm/data path in the /opt/mattermost directory instead of going up to the root directory. Previously on 6.1, I had it pathed as the /mnt/mm/data and found it worked just fine. And all those are possible, this is a personal home project, and I’m not super knowledgeable or experienced in much of this except rudimentary understanding of linux and following instructions.
But, setting up data as a symlink in the mattermost directory while the link points to the /mnt/mm/data directory did do the trick.