Win Explorer not seeing all NAS drives

FWIW, I have an old Readynas Duo (V1) and a Western Digital My Cloud EX4.  The WD is my default NAS, the Duo backs up the WD on a schedule.  With the WD powered up, there are times where it doesn't appear while "browsing" the network despite having  persistent mapped drives.

When the Duo is on, maybe it shows up and maybe it doesn't.  While I don't keep drives mapped, I can easily add one using the UNC like StephenB says above.  I can ping them both by name.  I can view the shares on both with the "Net View" command.  

My IPs are reserved in my router.  My PC is on Win11 23H2 (no 24H2 yet!!).  I do a full shutdown at the end of the day (no hibernation) and a cold boot the next morning. My WD and Duo power on/off on a schedule (WD is daily, Duo is weekly)  so they are freshly booted.  Both are EOL so they run whatever is the last firmware released from a few years ago.  Despite all of this, they work well enough for my needs so they will keep serving until they completely quit.