Good - in the end, finding the answer to this is multifaceted. Here is what I need to do to get everything working.
- Files really needed extensions.
- The server was not configured correctly. It should provide a progressive loading response, responding with a range of headers.
Updating our server to provide this answer. And add the correct extension to the video files, we will now go to AVPlayer, as expected. Thanks to everyone who offered advice!
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