You are absolutely right.
When calling the OCR method using the 'mistral-ocr-latest' model, if you send an image or a PDF with embedded images, all you get in the markdown property is a "".
I've tried everything imaginable, from running in batch, using the upload method and even sending them as base64 strings. Added payment info and changed to the pay-as-you-go plan. No luck.
I guess there's something wrong with Mistral OCR, a bug or it's simply a scam.