uORB read topic instance

Hi. In the support package for PX4 autopilots, when I use uORB Read for sensors, e.g. SensorAccel, i am unable to specify which instance to use, i.e. there are 2 accelerometers publishing data, and i want to receive separately on 2 blocks from instance 0 and instance 1. There should be a possibility to select which instance for multi instance topics, but it does not show up in the block?

[dpb]

"In the support package for PX4 autopilots,"

Post a link; not many (if ay) are going to know anything about specifics.

I suspect if the doc's/examples don't show and there isn't additional specific information from the product vendor you'll have to request support from Mathworks and/or the vendor depending on who supplied the support package.