I'm sorry to hear that you're having trouble accessing the files on your Sandisk Ultra Dual OTG/USB drive. Here are a few troubleshooting steps you can try:
1. Check the USB port: Make sure that the USB port on your phone and PC are working properly. Try connecting other USB devices to see if they are recognized.
2. Clean the USB connectors: Sometimes dust or dirt can accumulate in the USB connectors, preventing a proper connection. Use a soft brush or compressed air to clean the connectors.
3. Restart your devices: Sometimes a simple restart can solve connectivity issues. Try restarting both your phone and PC.
4. Try a different USB cable: The issue could be with the USB cable itself. Try using a different USB cable to connect the OTG drive to your devices.
5. Update device drivers: Make sure that the USB drivers on your PC and phone are up to date. Sometimes outdated drivers can cause connectivity issues.
6. Use a different USB port: If you're connecting the OTG drive to a PC, try using a different USB port. Sometimes certain ports may have issues.
7. Check for compatibility: Make sure that your OTG drive is compatible with both your phone and PC. Some devices may have compatibility issues with certain OTG drives.
If none of these steps work, it's possible that there may be an issue with the OTG drive itself. In that case, you may need to contact Sandisk customer support for further assistance or consider getting a replacement.