I have created a InDesign CC 2017 book (.indb) that contains 8 individual documents. The first document in this book contains a number of hyperlinks to individual pages within each of the other 7 documents. The links are each applied to particular selected text. The links when tested within Id CC 2017 work correctly.
However, when I export the book to an EPUB(Fixed Layer) the hyperlinks only partially work, as they only link to the first page of the correct doc, but not the actual page within that doc.