Make sure Android Studio is not recognizing (which I think is unlikely) by opening the Android Studio terminal and typing adb devices
, if it does not appear, the problem is probably that Lenovo, like many other manufacturers Eastern, use "generic" drivers that are often not recognized.
First of all, the ideal is to eliminate some points that may cause adb to not recognize the device.
Verify that debugging is enabled in the developer options
Check the storage options if MTP is selected.
Restart the device and place the usb cable shortly after the "Lenovo" message appears
Check on adb devices if it did not appear in the list
Check the disk manager if the device appears as unidentified, should mount it.
Usually these steps work out. :)