We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Table of contents and upload files
Trying to upload my file and took many messages of errors, I found that, in the help I asked, the answers were whether so simple that I couldn't understand because I didn't know, or to complex that they didn't actually didn't answer to the real problem I had. The system of Lulu many times didn't recognize the real problem, for example, I upload my file ready in pdf, because I didn't know Lulu's system do that, and gave me an error for the font. Then I tried the document as Word system gave it to me with the font that Lulu told me it was wrong and uploaded just fine.
So, Lulu's system turn any document to epub or pdf, so we upload our files us the Word system gives to us saving it to the preparation us marked as final. Also if we want to make our book to epub, must make the chapters with HEADINGS and save as I said before. If we want to pdf, make the chapters with HEADINGS and make a table of contents.