Thanks for getting back to me.
So, unfortunately it’s still sort of only half working: as soon as I saw your last post, I did EXACTLY as you asked: restarted, prepared the sample, tested it in MF V, and only then did I turn the hardware MF back on and re-connected the USB. Although it didn’t happen in exactly the order that you predicted, as soon as MF V saw the hardware, it immediately started to sync the samples (this occured before I even pressed the “Link to MiniFreak” button.) And when it was finished, I found that it had succesfully brought over the sample that I had made last night. It works perfectly as a synth oscillator, in both MF V AND with the hardware synth.
But: as you instructed, I had also made a sample this morning ("Generate your Sample: . . " just to be thorough), and before turning on the hardware synth, I had, as you put it, “Deployed the File”, putting this sample it into the correct directory.
And during the syncing process, even though MF V had synced the sample I’d made last night perfectly, as far as the new sample I’d made this morning goes, MF V did in fact seem to place some sort of sample-or sample proxy-into the hardware, with the correct name of this newly made sample. But when I try to use it as an oscillator, the hardware reacts just as it did last night: this new sample is selected, but the hardware actually ignores it and instead plays one of the samples immediately adjacent to it-either the one immediately above or the one immediately below.
I’ve tried to redo the process, again following your instructions to the tee, but since first being able to trigger the “sample sync” process, following your instructions this morning, I have not been able to duplicate this process. No matter how many times I have re-traced my steps and gone through your instructions again and again, I have not been able to re-trigger “sample sync”
So, I’m stumped at the moment. I wish that I could get rid of the erroneous sample that has been transferred onto the hardware synth, but it doesn’t look like you’ve built a means of erasing samples from the hardware synth-only a procedure to copy samples onto it.
So, if you have any insights or solutions, then I’d like to hear them. If not, then it looks like I might just have to wait some more for Arturia to finally make good on their promise 
It’s too bad, too, because the sample that did make it over to the hardware unit sounds great, and I can already have a lot of fun with it. So, thanks for that one, at any rate.