I created a table:
CREATE TABLE "tester" ("test" character varying(255));
and tried to insert values into it from a csv file (example is attached). It works if the file has each field wrapped in double quotes, but double quotes and not mandatory for a csv file. They are only needed if the column contains a comma.
It displays "import success!", but no values have been imported.
If you have values such as:
then it imports only the first record correctly, the one not being within double quotes being ignored.