[KayFisher]

I get the following error when I try to load in an epub from Apple.

calibre, version 5.17.0
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/Kay/Pictures/iPad User Guide iPadOS 14.5.epub to the book: /Users/Kay/Pictures/iPad User Guide iPadOS 14.5
With error:
Traceback (most recent call last):
File "calibre/gui2/add.py", line 488, in add_formats
File "calibre/db/cache.py", line 1529, in add_format
IsADirectoryError: [Errno 21] Is a directory: '/Users/Kay/Pictures/iPad User Guide iPadOS 14.5.epub'

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Directory works fine with Calibre and other .epub files.
Tried changing file name - no help.

Respectfully,
Kay Fisher