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Currently the CLI only sends images from the most recent image-
containing message. This prevents doing things like sending
one message with an image and then a follow message with a
second image and asking for comparision based on additional
information not present in any text that was output.

It's possible that some models have a problem with this but the
CLI is not the right place to do this since any adjustments are
model-specific and should affect all clients.

Both llava:34b and minicpm-v do reasonable things with multiple
images in the history.