I also have the Note 20 Ultra and have noticed the same issue since the update to Android 11. FBReader Premium cannot be called from Calibre Companion, though it runs fine from file explorers. Similarly, Calibre Companion fails to transfer the book to any of my PDF programs to read PDF files, including Acrobat, Drive PDF Viewer, Microsoft Office, CDisplayEx, ezPDF Reader.
I read somewhere that Android 11 has new policies on how apps access storage, but I have no idea whether new code is needed in Calibre Companion, or the readers, or both.
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