Thanks for the response. Maybe a better explanation of how to export books would help; I found several answers that say to just drag-and-drop to my Downloads folder and then import to other programs normally. Calibre opens if I say File, Open With from my directory, but does not read the file - just does nothing. If, within Calibre I try to import the epub, it pops up with a "Failed to open", then shows my directory and the file name as the name of the imported file. Trying to open that link just says its not there. Most of the error message says:
calibre, version 6.11.0
WARNING: Errors while adding: There were problems adding some files, click "Show details" for more information
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Failed to add the file /Users/MyDirectory/Downloads/File Name.epub to the book: /Users/My Directory/Downloads/File Name
With error:
Traceback (most recent call last):
File "calibre/gui2/add.py", line 487, in add_formats
File "calibre/db/cache.py", line 1810, in add_format
IsADirectoryError: [Errno 21] Is a directory: '/Users/My Directory/Downloads/File Name.epub'
The files should be in my Books directory as I make sure they are downloaded before trying to drag to Downloads. I tried importing a new book to Books, then exporting, but the error re-occurs.
Each file opens correctly in Books.
Any help is appreciated. Thanks.