Hello Matthew

Thank you for your interest.

The plugin is guessing the column type based on the data it finds in the cells.

If you have alphanumerical data in the cells, they will be seen as Strings unless the majority of values are in fact numerical, so the plugin sees them as integer or float.

Could you send me one file as an example, so I can see how it behaves on my end?

Hi again Matthew

We are using wordpress function wp_upload_dir() for location of upload files. By default is set to the upload folder (wp-content/uploads). However, you should be able to change that location. On this link you can see how to do that.

As for the column types - I don't see an issue there, string columns are saved as string columns, and numerical columns are saved as Integer. You only need to remove the thousand separator for the years, but that's about it.