Using a new my passport for Mac

new to all of it, just got a new iMac 24 w/ Monterey OS, after years of window use … I bought a “my passport for Mac” to backup my music library…which I can understand seems redundant, to some, but always having had the “backup” in a piece of hardware, has been my M O , a just in case scenario for an old guy that can not learn new trix … problem is getting the music files ( iTunes library ) onto the new passport…old way just made a folder of artist / album / etc dragged it over…
but ??? now …ugggh … not exactly a tech guru …so
help :crazy_face:

Hi @roodoob,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:
https://support-en.wd.com/app/ask

yeah … it took 4 days to finally get in touch w/ someone who was able to help…
some back n forth w/ communiques …
I think I have it ,but, that said …
I tested getting files onto the drive, w/ the rep on the phone guiding me…looked good … I ejected the HD…then this AM, plugged back in to do some saving …and
could Not find those files , we’d tested , yesterday ?!?
any idea what I’m missing ?

thanx