Hi there! I see you're encountering a "please select at least one device" error when trying to send photos to a Vphoto folder. To help you better, could you tell me a bit more about how you're selecting devices in the app? For example, are you trying to send photos to a specific photo frame or device, and is the device already paired or connected in the app?

Meanwhile, here are some initial steps you can try to address this:

1. Check Device Connection: Make sure your Vphoto frame or device is powered on and properly connected to the same Wi-Fi network as your computer or phone. The app needs to detect the frame as a target device to send photos.

2. Select the Device Explicitly: In the Vphoto app, when you initiate sending photos, there should be an option to select one or more devices (frames) to receive the photos. Ensure you explicitly select at least one device before sending. Sometimes the app might not automatically select a device.

3. Restart Devices: Restart both your computer/phone and the Vphoto device/frame. This can refresh the connection and sometimes resolve detection issues.

4. Reinstall or Clear App Cache: If the app has cache or data that's causing glitches, clearing the cache or reinstalling the app can help its functionality reset.

5. Verify App Permissions: Ensure the app has the necessary permissions to access photos on your device, which is sometimes a prerequisite for sending photos.

Let me know if you've already tried any of these, and if not, how it goes after trying them. Also, any extra details you provide will help me guide you better!