Product import doesn’t like special characters

Hi,
I’m trying to import products from a CSV file, but it display any special characters as ?, whether I write it HTML code or plain, for instance: ° or ° turn into ? after import. Happens both in the regular description field or custom meta fields (see Storage in the link I’m sharing).
Is there something I should configure in the CSV file for it to work? What’s the appropriate behaviour?

Thank you.

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