post deprecatedhttps://cloud.seatable.io/dtable-server/api/v1/dtables/base_uuid/append-csv/
In an existing table, you can upload a .CSV file with the same headers
to append its content below the existing rows. A .CSV file with
different headers cannot be appended to an existing table.
This call does not exist anymore
Due to technical problems and performance issues this API was replaced by another call. Use Import base/table from xlsx instead.