If that is Western Digital MyBook Live it is probably using samba protocol for connection.
Look if you have intalled packages (with pacman -Ss) smbclient, gvfs-smb, udiskie, udisks2
I am not sure which are the correct packages but I have these and I usually don’t have problem connecting drives.
It is also possible you do not have permission to mount the drive (you may need to run thunar as root - this may not be entirely safe/sane thing to do).
It’s a Micro$oft product, that allows a filthy, polluted windoze machine, full of malware and backdoors to connect to your pure, innocent GNU+Linux system. You are perfectly justified in being terrified of it.
Sharename Type Comment
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IPC$ IPC IPC Service (My Book Live Network Storage)
Public Disk Public Share
SMB1 disabled – no workgroup available
running the second command gives
[iand@Linux ~]$ /usr/bin/smbclient \\192.168.1.211\Public
Can’t load /etc/samba/smb.conf - run testparm to debug it
Password for [WORKGROUP\iand]:
Try “help” to get a list of possible commands.
smb: > help
It looks like samba is working on the NAS.
In Thunar can you enter smb://192.168.1.211 or smb://192.168.1.211/Public into the navigation bar (where you see your current Path)? Does that connect you to the NAS?
I tried a different approach and installed the Budgie desktop as opposed to the xfce one - and it all just started working ( Never have quite got my head round why this sometimes helps ) point is, I am up and running with Endeavour OS and really pleased with how fast and nimble it is