I have been using EpubMerge for years with Calibre in order to merge large book series and than easily navigate them using the generated Table of Contents on an eReader. The eReader that I have been using is Marvin 3.
Lately, I have been having an issue where when I merge multiple books, I am only receiving the table of contents of one book, even though I have the settings enabled to "Insert Table of Contents entry for each title" and "copy Table of Content entries from each title".
To give a relative time frame; I had created a merge of 10 books in Nov 2021 and it displayed each of the titles+table of contents when opened in Marvin 3. Now, I am merging an additional book to it and suddenly it doesn't work.
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