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Cannot detect any effect or menu selection or operating button. Do not recognize how to configure nextcloud account.

This is a FileLink Addon that does not add UI elements by itself. Please refer to the documentation at https://joendres.gitlab.io/filelink-nextcloud/#installation for help.
If that does not solve your problem, please feel free to contact me for further explanation.
If it does I'd be grateful for an update of your rating.