If you have experience there is not enough storage on your device, you can use the USB drive or micro SD card as extra storage for your device.
After you plug in the USB drive or micro SD card on your device, you can go you the editing screen session.
Click Advanced, then click More
Check "Use external Storage" and select Auto Detect in the "External Storage Path".
After that, OptiSigns app will use the external storage on this device.
If you have any additional questions, concerns, or any feedback about OptiSigns, feel free to reach out to our support team at firstname.lastname@example.org