Thank you. Not too experienced at this, so it's great to have forums like this, and moderators to help keep things running so well. I'm now up to sharing 63 of the 71 files, having added .mp3 to the end of each. I'm only sharing .mp3s.
Of the ones that still don't show up in the library, I checked them and 2 are .mp3, and the rest are listed as "movie player documents" (Quicktime) or "iTunes" documents. However, several files that DO show up in both places are "movie player documents" (Quicktime) or "iTunes" documents. So I'm still not up to speed on that. And still 2 or 3 of the files in my library under "incomplete" are files that I actually have (maybe I tried to download them twice, and kept one, but neglected to kill the other).
Thanks again for your timely help. pbb