My portfolio in SFMC was switched to Classic content but I'd like to go back to the most recent version. I can't seem to find a way to do this. Does anyone know?
Switching back to the content uploaded as part of the newer Content Builder can be accessed through the Content Builder link in Email Studio.
If you are referring to upgrading the portfolio within Classic Content, this to be done through support. I did this recently and they were a bit confused by what I meant, so pro-tip: Ask to activate the business rule Enhanced Portfolio Access.