"lino dataconnector add " is not updating the file dataconnector.yaml

Preconditions:
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install LINO version v3.1.0 on windows
Run command " lino dataconnector add xxxx "
Example:
lino dataconnector add dvdrental --read-only postgresql://postgres@localhost:5432/dvdrental?sslmode=disable --password

Action:
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Run another command " lino dataconnector add yyyy " with a new connection string
Example (port upate):
lino dataconnector add dvdrental --read-only postgresql://postgres@localhost:5433/dvdrental?sslmode=disable --password

Problem:
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the command "lino pull " is still trying to access the target of xxxx connection string.

Expected behaviour:
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Each time a "lino dataconnector add" is executed, the file dataconnector.yaml should be updated.