Allow files with custom extension to be picked up by document picker

I have implemented a document picker and trying to pick a file from iCloud Drive or File system. But, the file appears hazed i.e. it couldn't be picked. The file is a simple text file with 'cbz' extension(requirement of the app).
I followed below link but didn't get it working.

developer.apple.com/library/content/documentation/FileManagement/Conceptual/understanding_utis/understand_utis_declare/understand_utis_declare.html

Can anyone point me in the right direction?

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