I can’t speak to all of the retailers and libraries you want to reach, so take what I do with a grain of salt.
I upload a properly formatted Word 10 .doc to Smashwords. They then do the formatting required to publish to all of their platforms on the Channel Manager. I won’t list the conversions/formatting they do, but it’s a lot. There are plenty of retailers you can select or not using the Channel Manager, also, once the product is verified and accepted.
Because Smashwords hits so many retailers, including Apple, I use my Smashwords .doc file as my master. The current date is part of the product file title if I have to do any editing for re-upload. It works for me for 60 titles or many more. I’ve stopped counting. I also do this full time, so for me it’s a part of producing output for customers who want to read my product.
I use Word 10 to convert the .doc to a .docx for upload to Amazon. I allow Amazon do the conversions required for Amazon.
I upload a .docx file to Kobo. It then does the conversion required for its subscribers.
I use Calibre to convert the .docx to an .epub for Google Play.
Barnes&Noble is a primary vendor of my product, along with several others. I use the Smashwords Channel Manager to hit all of them.
Like I said, this is what works for me. I can’t speak to your vendor requirements.
Note that I don’t do print. I’m ebook only. If you do print, all of the above is not relevant.
Need I add that I use Scrivener for all of my writing? I think not, but hey, all donations gratefully accepted. I’ve been using the Win 3 Beta since v7 to produce product.
Oh, and one more thing. I export my Scrivener product as a text file, which I load into Word 10. I have Word’s Styles function set up to produce a product that suits my formatting style. Of course, if you’re using Scrivener’s export function, your mileage may vary. I use the text formatting in Word as another way to edit the final product.
It all works for me.
Edited to add that this is probably more of a process post than a Bug Report, but I wanted to say, in a long-winded way, that there’s more than one way/format/product output to hit all the retailers to sell product.