Thank you for this great question. Unfortunately the way the app is set up, it can't reach out to other parts of the device file system, including an SD card. If attachments are saved with a feature, they can be downloaded on to your device for work offline. I understand that you aren't using attachments, that this is linking back to a server/file share, so that might not be helpful. But for off line work, using attachments is really the best advice I can give. I hope this is helpful.
