I connected a external SD module to the headers on the Portenta breakout because i want to be able to switch the Sd card between the Portenta and another device. Only one device will be powered at a time to avoid collisions. However the OpenMV firmware does not seem to recognise the SD card because it keeps mounting the internal flash. When i upload a Arduino SDcard example the card is recognised and read without issues.
Note that currently only the portenta is connected to the SD and it does work when i plug the SD directly into the breakout.