No you are not missing something. Thanks for being very clear about what you did. That is correct. Now, Save what you have in Publisher and Lectora. Make a copy of the Lectora title using Save As. Then delete the parts that are already in Publisher. Try again. If that does not work, delete a little more in Lectora and repeat. My guess is you will likely get more in. Once you have them in Publisher, you should be able to merge the bits.Also, try publishing in Lectora and if any errors show up, fix them. If you have any, they might cause a problem on export.