@Chris Harris Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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The gpt-4o-mini-2024-07-18 model does not support image inputs for fine-tuning. This model is designed for text-to-text fine-tuning only. See here.
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To resolve this, you can Use a Different Model: If you need to fine-tune with image data, consider using a model that supports image inputs, such as the gpt-4o-2024-08-06 model. More info here and here.
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Hope this helps.