Hello, This product can be used for data transfer by connecting the card in the camera directly to the phone. But if it only charges the phone, you can check the following steps: • Make sure the SD or TF card is properly inserted into the adapter. • You need to open the “Files / File” application on your phone to transfer files. When you insert the card, the contents appear here. If you are using an iPhone, you can access it through the “Photos” or “Files” application, and on Android from the “File Manager” application. • The camera is not connected by wire, you need to remove the card and insert it into the adapter. � � So if it's only charging, the card may not be inserted, or the phone may not open the file viewing application.