I'm trying to export an InDesign file to an EPUB and one of the components of the file is a grid that appears when exported as a PDF and when viewed in InDesign but does not appear in the EPUB or the list of items in a layer. As it isn't in the list, it is not selectable and I can't play with how it should be exported.
Here's an example of the file with the grid: https://www.dropbox.com/s/m2aq8xtmc97czxy/book-test.indd
And here is a PNG export with the grid.
Can anyone suggest how I can get the grid to be exported as part of an EPUB?