Just to be clear: your VU+ does not even switch on from standby or it does and then it gets stuck?
What kind of mounting have you set? Usually FSTAB (mounting at boot) is the more effective. I don't suggest, instead, the AUTOFS mode.
And what happens if you switch the power of and then perform a complete reboot?
Yes, this is IT...
For instance: did you set the NAS as substitute of the HDD? I wouldn't to that, for instance.
No, it's my fault: reading the word "share" I assumed it was a NAS, not a HDD.
OBH is very comfy at managing files, browsing folders, move, copy, rename and play them.
root@vuultimo4k:~# gdisk -l /dev/sda1
GPT fdisk (gdisk) version 1.0.4
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries in memory.
Disk /dev/sda1: 15628050432 sectors, 7.3 TiB
Sector size (logical/physical): 512/4096 bytes
Disk identifier (GUID): 1F00FD71-3942-4D71-96E9-DE6F825070EF
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 15628050398
Partitions will be aligned on 2048-sector boundaries
Total free space is 15628050365 sectors (7.3 TiB)
Number Start (sector) End (sector) Size Code Name
Ok maybe it's not related but I noticed after I configured nfs mount on pc, probably I mistake and there was just a simple "cut power and solve" better this way1) OK, but I couldn't understand even because there should be no link between the fact you shared this HDD to your PC and the VU+ behaviour. I think is unrelated. VU+ is a passive actor in this case. I suspect it was not this the cause of your issue.
2) as you see, you haven't mapped your hdd: please do it and assign it as /media/hdd by browsing the options. OBH is able to work even without mapping a unit but maybe the PC's OS works better (I don't know, because I use the next approach, as of point 3) .
3) The most effective way to read/write files from a PC to the VU+ HDD is not the share, too much dependent on the PC O.S. and its actions, but a FTP client like Filezilla or similar.