Emby seems to be a media server.
I think you mean how to use emby in manjaro on that drive?
I would say consult their documentation … but they dont seem to have much.
ext, like all good filesystems, has permissions.
This can work with users or groups.
If you formatted an Ext partition … you wont have access besides ‘sudo’ because only root user/group has access.
https://wiki.archlinux.org/index.php/File_permissions_and_attributes
https://wiki.archlinux.org/index.php/Users_and_groups
What I would do is create a directory in that partition and set permissions how I want.
Most likely using groups (say … the wheel group … or make one up)
But you could also set that directory to “Everyone” too.
But lets just do an exercise …
I will assume your new partition is mounted at /mnt/embydrive, and that user is zombtux
sudo mkdir /mnt/embydrive/my-storage
sudo chown zombtux /mnt/embydrive/my-storage
Then your user owns it and you should be able to mess around that directory all you want without sudo.