upload_mimes not accepting CSV

You can’t upload anything except images, documents, audio or video files—and it’s good for security, But in case you want to allow specific file type to upload in media library you will have to define ALLOW_UNFILTERED_UPLOADS.

Put this code in wp-config.php file.

define( 'ALLOW_UNFILTERED_UPLOADS', true );

This code doesn’t allow every user to upload every file type, though. Only administrators are allowed to upload whatever they want.

Source: https://code.tutsplus.com/articles/new-wp-config-tweaks-you-probably-dont-know–wp-35396

https://codex.wordpress.org/Uploading_Files

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