As may be painfully obvious, I have only the minimal acquaintance with the hard and soft technologies that underly my ability to write my thoughts in standard English text which then appears on a video screen. The same goes for those technologies' attendent jargon, even jargon no longer recognized as such by those who have become conversant in its arcane subtleties.
Keeping that in mind, here are my observations of the text formatting following the update of Back Trail dated 3/5/2023:
My bonafides: My Back Trail file was formatted in LibreOffice Writer version 7.4.3.2 (x64), whatever that means. NOT that I'm asking for an explanation--I can already feel my eyelids getting heavy.
I saved it in an odt file by this process: On the standard "writing" screen, I clicked File/Save As/Save as file type: ODF Text Document (from the drop-down list). I saved the file to my Desktop to keep it handy.
Then I uploaded through the SOL wizard.
Here's what I've noticed to date:
Ellipses
The elipsis (...) at the very end of Chapter 18 (and...) converted to a solid line. An ellipsis in Chapter 3 (in the same paragraph as the word "porky," for reference) was preserved in the update.
Italics
As best I can determine, none of the italic formatting transferred. I italicised the cigar brand, Guardia Real, throughout my odt file, but those I've seen are in standard text, not italics.
Text indents
I see no evidence of indented text. Most of the very short Chapter 16 is a handwritten letter formatted both indented and italics in my odt file. I use that format for block quotes from letters and telegram texts. I haven't found any in the update.
ñ (tilde N)
These, most happily, appear to be intact, of the several I searched for. This is perhaps the most gratifying format transfer, for my particular story context. It easily overshadows all other issues herein.
Centering
I only centered the "Chapter #" which were all converted to the SOL standard chapter heading.
To be determined
Will text indent if it is not italics? Any bets? It will be my next format for correspondence quotes.
Just for experience, and per the recommendation from dozens of correspondents, I intend to convert the next book, False Trail, to HTML. I will use LibreOffice Writer's Save As/Save as file type: HTML Document (Writer), then see how that comes out.
After that, I may have to try the unique suggestion of limnophile##### (actual numbers redacted by me), who recommends conversion of text to UTM-8 format. He (presumed gender by me) provided a URL for that purpose, which I will share only with those who will sign a Waiver of Liability, as this limnophile##### comes across as a somewhat shady fellow. Actually, he was quite helpful despite my off-the-wall responses. I have no idea if this is SOL author limnophile, but I have my suspicions.
Thanks to all who offered advice, though I have to confess to having mostly no idea what you all were talking about.