I think you may have been tinkering with settings a little too much. Try resetting the camera back to factory defaults.
There are a couple of modes of operation that only work with JPEG files. One of them might be in-camera HDR shooting.
Eric you need to reset the camera to default. Clear all settings. Raw is not available with all settings.
I believe it is. Image size is one of the few custom settings that does NOT have a little star indicating that it is only available in creative modes.
From my T6S manual: