The microSD card on a Roku is only for channel storage and there's no way to add additional channel storage to any Roku device that doesn't have a microSD slot. It shouldn't be necessary as it will automatically load and unload channels as necessary.
Yes that’s the reason I want to confirm that we can add an SD card to the Streambar. I hate to have to keep loading and unloading apps and would rather have an sd card to store them on. Since it doesn’t have a slot for the sd card, I wanted to see if we can connect a card reader and the card. Or perhaps just connecting a flash drive.