The fact that you can map the folders (post #12) and transfer files says that samba is working. The missing entry in the Network page is down to the vagaries of either the MSoft or device coding.
I don’t have a 4000 (and judging from the posts here I have intention of getting one, but that’s for another thread) so cannot check this theory…
One problem I did have was that I found one device not featuring on the Network app and discovered that it had the homegroup name set different to the other devices. Changed that device to the common name and up it popped on the Network. Win7 and Win10 will not report a device which has been designated in a different homegroup to the PC. I assume that the 4000 uses simple network protocols and does not register on a homegroup so this would not apply.