Describe the bug

• LLMs (tested with Anthropic) are erroring out while being provided images or files (pdfs) in v1.7. I tested the same code in v1.6.1 and it works perfectly for images (note pdf support was added in v1.7).

To Reproduce

• Try to load an artifact in v1.7 that's an image (png/jpeg etc).

Expected behavior

• LLM responds processing that image context

Screenshots
Exception:
litellm.exceptions.BadRequestError: litellm.BadRequestError: AnthropicException - {"type":"error","error":{"type":"invalid_request_error","message":"messages.4.content.2.image.source.base64.media_type: Input should be 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'"}}

Desktop (please complete the following information):

• ADK Version 1.7 (works fine in v1.6.1)

Model Information:

• Claude 4.0 Sonnet

Additional context
Add any other context about the problem here.