OTG is a special option that allows you to connect two devices using a special cable. For example, you can connect your mouse directly to your phone. This type of connection does not require a computer or other device. It is enough to buy a special cable and connect it to the phone connector.
At each end of the OTG cable, there are two connectors: USB and Micro-USB. You can also find options that support a modern port USB Type-C. This cord allows you to connect a flash drive, mouse, or keyboard to your smartphone or tablet. As for phones, almost every modern model supports connection via OTG cable.
If you use your smartphone to view the data on your flash drive, then connect it with an OTG cable. Then start the file manager and wait until the message appears that the external device is detected. It remains to open the desired folder and view the files.
To check if the MHL standard (OTG and HDMI) is supported, you can use an app from Google Play, such as this:
