dslrdashboard.info

What exactly do you mean under 'portait mode'?

Sony a6400 will only work with wireless and not with USB.
Currently USB is only supported for Nikon and Canon cameras.

USB connection only works with Nikon and Canon DSLR.
With Sony only the built in wireless is possible using the 'Smart remote control' camera application.

The live view image is sized according the information that qDD gets from the camera.

Please contact me with the support mail.

Can you try another USB OTG adapter?
How long is your USB cable? Do you use the one that you get with your camera?
Try to connect the camera without the SD card inserted.

In qDslrDashboard settings disable the 'Use Android native USB access' option.

Next version will have improvements regarding EOS R and RP.

In qDslrDashboard not. You can use the custom bracketing but you need to set the initial camera settings, including shutter speed.

What camera do you use? How did you connect (USB, wireless)? On what platform do you use qDslrDashboard? What camera settings did you use?