I can create a file with up to 7 hyperlinks and when the file is added to Calibre it creates a zipped file. I can then convert the book to any format and the links work. Over seven hyperlinks though, and the file remains in HTML format when added to Calibre and the resulting file has no hyperlinks.
I've been testing this for two days and still haven't found a work around. I zipping the files together manually and converting but the chapters aren't in any particular order. I also tried zipping the single file with the hyperlinks in it but no hyperlinks are created when I convert the file.
I tested this by created 10 files with one additional hyperlink per file. All were zip files until I hit number 7. I had been randomly getting files with hyperlinks and some without and was trying to determine the common thread. I experimented with a variety of files, number of links, output type, etc. I finally noticed the zip VS html file that Calibre was creating.
Anyone else experiment with this to see if they have the same issue when using a number of hyperlinks?