How to find all external shares and the activity?

Over sometime, I have shared some files and folders with external people.

How can I find out all the resources that have been shared with external people, so that I can review periodically and disable if not needed.
How can I see the activity from external people – trying to access the shared folders/files?
3. Is there a way to create custom domain for workdrive - like other Zoho apps so that people can access the drive from drive.<mydomain>.com

Thanks,

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