ComfyUI to WordPress REST API Upload Issue: "cannot fetch file with selector" Error

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I'm trying to upload images created with ComfyUI's Workflow tool to WordPress via the REST API, but I keep getting a "cannot fetch file with selector ['1736420928328', 'files']" error. Any ideas how to fix this?

(Interestingly, when I test by attaching a file using the "Single File" option in the "Start Node" and using that as the binary in the HTTP request, it uploads fine.)

2. Additional context or comments

No response