It's never happened to me, but I remember my mom sent me pictures in a Word file. Weird I know. But I was able to get those images out of the "wrapper". Maybe if you think of it as a wrapper? Maybe you can download it from your own drive and save-as another format? I'm just trouble shooting aloud. But maybe that can help you figure it out.
Is it my understanding that a .gdoc is just a wrapper, a storage extension but not the actual document itself. I think .gdoc is just a reference, not an actual DOC as you might think. So in that reasoning all files are gDoc's on Google Drive, but really they are exactly what you uploaded them as. I think if you download the file it will still be a JPEG. Let me know what the file becomes when you DOWNLOAD your file back to your desktop computer.
OP Solved own problem as a result using reasoning:
- zamzar.com/convert/docx-to-jpg and
- convertio.co/docx-jpg to convert them