How to check the file format on an image to run through Tensorflow style transfer demo

Question

Situation

I'm trying to use my own images in the Tensorflow Style Transfer demo, but they're causing the following error message:

InvalidArgumentError: Unknown image file format. One of JPEG, PNG, GIF, BMP required. [Op:DecodeImage]

What I've tried

The error message says the file format must be a JPEG among other file types. When I check the file info, it says Kind: JPEG image, and the file extension is .jpg.

The image was shot on a Google Pixel 6 Pro, pulled directly from Google Photos, and then uploaded directly to my GCS Bucket. So I can't understand how there could be a problem with the file format, or what to check for to resolve this.

I've also tried several links to the same GCS object.

https://storage.cloud.google.com/01_bucket-02/PXL_20220315_232045529.PORTRAIT.jpg

gs://01_bucket-02/PXL_20220315_232045529.PORTRAIT.jpg

But I'm getting the same error message with both.

I'm able to view the images in a browser window, so my authentication should be ok.

Causing further confusion, I downloaded one of the wikimedia images used in the demo, then immediately uploaded it to my GCS bucket, and it caused the same error message. The Wikimedia file was .jpg, but when I downloaded it, the extension was .jpeg.

This is the original Wikimedia file I was testing:

https://upload.wikimedia.org/wikipedia/commons/d/d7/Green_Sea_Turtle_grazing_seagrass.jpg

Any clarification on what might be going on with this would be greatly appreciated.

Doug