Always use [Eject] when you remove a USB storage device. Otherwise, it may cause errors on the USB storage device.
To disconnect a USB storage device, select the device to be disconnected from the external input list on the TV and press the [Eject] button.
Try this
How to eject a USB device from products released in 2019 and onwards (WebOS 4.5 or later)
※ The menu screen differs depending on the model. Please refer to the user manual for details.
1. Press the External Input button on the TV remote and select [ThinQ Home Dashboard].
2. Select USB 3 [USB Flash Drive].
3. Select [Eject] to safely remove the USB storage device.
How to eject USB devices connected to external inputs
1. Press the External Input button on the TV remote and select the USB device you wish to disconnect from the list.
Select the Eject option appearing above the device icon.
This guide was created for all models, so the images or content may be different from your product.