The problem lies within your PC. Given that you are running the latest B2B software, when you ran 'Start NAS' on the B2 and saw the message 'Done' then that means the B2 NAS is running. That only needs to be done once on the B2.
To sort out the PC, you can run either wired or wireless, there is no difference, except that a wired connection is more reliable and faster than wireless in general.
You have already run steps 1 to 3, so go to step 4.
Enabling NAS on B2 and PC
1. On the B2 -- 'Main menu' check the scrolling display for 'IP Address' and note this down (something like '192.168.1.56'
2. On the B2, check your current version of software; on the B2 Remote, press 'Info' twice - good if your version is 09 Jan 2020 or newer.
3. On the B2, go to 'Settings->Maintenance->Start NAS' (You only have to do it once). This is to enable NAS on B2
4. On your PC, open Windows Explorer as shown in Snip-1 attachment
In the left side panel, locate the icon 'This PC' (or could be your PC name as in the example in the attached snips (in my case 'PL-Laptop'
5. Right-click on this icon and select 'Map network drive'
6. In the 'Map Network Drive' panel, fill out the fields as shown in Snip-2 attachment. Use the IP address that you noted in step 1 above.
7. In the 'Folder' field, enter '\\192.168.1.56\music' without the quotes but substitute your IP address for the one shown here.
8. Tick box 'Reconnect at Sign In'
9. DO NOT select 'Browse'; select 'Finish'
10. A Windows panel 'Enter Network Credentials' will open up. Enter 'root' for User and 'brennan' for the password (without the quotes)
11. Tick box 'Remember my credentials' and click on 'OK'
An Explorer window should open up showing your B2 'music' files. It might take a minute ot two to appear, so patience is the order of the day!
You should now have a NAS connection running between your B2 and your PC. You can manipulate, move, copy music (and other files) to and from your B2.
Let us know how you get on.
Peter.