Unclear What the uploads count records, and whether it is sent anywhere, is not known.
What
A headless session is one run by a program rather than typed into on screen. These sessions now do an uploads count at the end of every turn, next to an existing memory count. A turn is one round of the model replying.
File writes also return extra details now, whether they succeed or fail.
Why
This looks like per-turn record keeping about uploads.
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What the uploads count records, and whether it is sent anywhere, is not known.