Can connect to AWS aurora via psql, but cannot insert

I would like to install only the postgresql client on Amazon Linux and connect to Aurora for use.Aurora is postgresql.

 psql-host-database-U username

You can also connect and select from the .However, when I try to insert, I get the following error:

ERROR:cannot execute INSERT in a read-only transaction

We have verified that the destination DB can be written separately from the Windows GUI client.
Do I need to set any settings for psql?
What I want to do is to insert the data by loading the file with psql in batches.