Formsnap3 data upload issue


I am having a problem where Formsnap 3 stack checkbox data is not being uploaded to the database.

Other field types seem to be OK as it adds the entry into the db just no checkbox data.

All software is the latest versions.

What data type should I use for the db field?

Thank you

I am also getting an error sometimes:
DB ERROR: SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Problem resolved. It was invalid characters in the field names.