It is hard to say what the problem is you encountered and offer any solution. Can you share the error message you got and example lines from your csv file?
I only can recommend you to check the document on the link below. CSV format of file might not match with default settings of PostgreSQL. You can adjust via parameters, such as delimiter, quote, and escape.
I'm downloading a table in csv using pgAdmin. Some tables work just fine. Others have JSON fields in the table and these aren't. What I get instead is a string with multiple unquoted double quotes that are, correctly I think, complained about by my csv reader.
Is there a way to get these quoted properly? Am I doing something stupid? Is this a bug?