The function create_blob_message does not adequately support file types other than images.

[FirstClear]

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1. Is this request related to a challenge you're experiencing?

I have developed a plugin to export the output of the LLM into a DOCX file. Although the plugin works correctly, the result of its execution is as follows：

only return the path of file.
then I debug the code，find create_blob_message will change the message type：

2. Describe the feature you'd like to see

When I develop a plugin related to file generation, it should provide me with the correct URL for downloading the file.

3. How will this feature improve your workflow or experience?

It should offer more file support to developers, enhancing the user experience.

4. Additional context or comments

No response

5. Can you help us with this feature?

• I am interested in contributing to this feature.