audiobooks and podcasts are seperated on a few different things.
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if you place any file in the audiobook, audible, or podcast folders the files will show under the respecvtive menu option.
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the genre also will sort the file regardless of the actual storeage location. for example, if the genre is set to audiobook it will show under the audiobook menu option. if the genre is set to podcast it will show up under the podcast menu option. no matter what folder the file is stored in.
once the files is sorted under the correct menu option it will be listed first by ID3 tag and if no ID3 tag is present it will be listed alpha numerically by file name.
to sort by ID3 tag I would suggest setting the Artist to the book name, track to 01, 02, etc for the order you want them played, and title to chapter01, chapter02 etc in the order you want them played.
For sorting by file name i would suggest the following file naming convention. Name_of_book_chapter01.mp3. This will sort them all together and in the order you want them.
note that when numbering the tracks you will need to lead with 0’s. for example if you have 25 files you will need to lead with 01,02 etc if you ahve 100 lead with 001, 002 etc.