Can't import translations from csv - config option greyed out

Total newbie here, apologies in advance. I’m uploading my first content via csv. Many of our strings have already been translated and only need validation. But the Configure page has an “Import translations” check box that is greyed out:

Without that checked, all content in the Translation column gets discarded by the import.
What’s up? Is this perhaps a feature not available on a free account?

Thanks,
Steve

Hi Steve,

Please choose Multilingual spreadsheet option first, then you will be able to import translations.

I only have data for one target language. After specifying multilingual, the file is rejected for not having multiple target languages.

Could you please send your file to support@crowdin.com?

Done. Thanks for your help!