Thanks for all the answers!
The F7 check says "No Trouble Found."
Running the EPUB Validator from the web yielded dozens of errors. I installed the plugin but it exits after reading for a bit. Is that output logged? It appears that some messages appear just before the window closes.
I have the epub document in an online Google drive. When I open it with an e-reader, it asks if I want to upload the file to Google Play Books. I say yes, and my tablet downloads the copy, but it hangs on "Processing" and eventually times out. This happens even if I just merge the first chapter, which is only 27 KB if I open the epub as a zip archive. The file remains perfectly readable in Sigil, but not by an ebook reader.
Ultimately, this may not be all that important -- I'm willing to let good enough be good enough, but I want to know what kinds of pitfalls may be near.
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