Insert the phone into the USB flash drive, open the OPPO phone and find the settings. After entering the setting interface, find other settings, and then click Open Other Settings. After entering other settings interface, find the OTG connection at the bottom and open it.

After opening the OTG connection function, go back to the first interface of the mobile phone, find file management and click open file management, then find and click all files in this interface. After entering all the file interfaces, we can see the current storage options of the mobile phone and the USB flash drive. Click the Open Usbotga option to open the USB flash drive file item. In this interface, we can see all the files in the USB flash drive.