Sony HAP-Z1ES + MacBookPro


Love my HAP-Z1ES.  Used it to feed analog into my pre-amp; now using its digital USB output to feed my Devialet 200.  Truly happy with it.
Alas: this week, with my latest MacBookPro software upgrade (MacOS 11.3.1, an update to Big Sur) I can no longer transfer files (using the HAP Music Transfer app) from the laptop to the Sony.  I get error messages, either "Some files are failed in transferring. Please check the transferred file list." or "Transfer cannot start because the device has not been ready for it."  (I've never gotten either of these before.) 

I pinged Sony via Twitter but don't really expect an answer.

Everything else (playing existing files; using the HAP app on my phone as a remote) works fine.

Thanks in advance for any Audiogoner who has advice, diagnostics, workaround.
Ag insider logo xs@2xhrodman
I have 2 Sony HAPZ1ES players in 2 systems.  I never use the Sony software, I just drag and drop. Have you tried it this way?
Ain’t Apple wonderful?  In addition to the suggestion from Stereo5, can you simply reload the previous version of the software?  I did that once, but it required a call to Apple support
Why does Apple make things so difficult in 2021?  You would think they would be more compatible with Windows operating computers.  BTW, the Sony runs on. Lynxes operating system. 
Thank you, all.  Have been corresponding with Sony support.  I might try drag-and-drop, though does that mean that Gracenote rather than yours truly supplies the artwork and metadata? 

For whatever reasons I'm seeing this as a Sony problem, not an Apple problem — perhaps because I've been struggling with an HP printer that always seems one or two versions behind the latest MacOS update ;)

Regardless: I've been listening to wonderful music on a good rig, and that's made all the difference during the pandemic.  Don't want to lose sight of that.
Continuing thanks,
   Howard.