Search solution for WD NAS PR4100

Dear all,
could you please help me to get solution for this problem,

no any search solution in WD NAS and quikfynd server is not responding, and all desktop Apps same like WD Sync or Mycloud not supported , also in web bage i can’t search ,how i can search in my files via my laptop , Am very suffered of this issue , i think this problem is very old, but WD company did not get any solution for the users, i hope to get any solution.

My NAS is WD PR4100

My laptop is macbook

I think you can do this via SSH terminal session:
for file name search use find command - like find /mnt/HD/HD_a2 -name workflow*.doc
for contents data search inside text files use grep command - like grep -r ‘London’ /mnt/HD/HD_a2/