I own two LRT Pro 3 timers, and I have all the cables required to use them with all my cameras — except my Sony A6700.

I use Sony’s BT remote to trigger continuous shooting for timelapse on this camera, but when using the remote, I have no direct control over the shooting speed other than the presets (Lo, Med, Hi, Hi+). I was hoping to use one of my LRT Pro timers to finesse the frame rate on the A6700, but it appears that the only connection option is the USB-C port, and the info in another thread here implies that I cannot control the camera through this port.

Can a Sony A6700 be controlled by the LRT Pro 3 timer in any way? Will connecting an LRT PRO 3 Timer to the camera’s USB-C port offer any control at all?

If the camera has only a USB-C port and no dedicated "release port" or "multi-port" as it's called by Sony, the LRT Pro Timer (and any other cable-connected Timer) cannot control it, I'm sorry.