Seems to be a known issue affecting Android USB file access over MTP. The MTP cache gets out of date until a reboot of the phone. A workaround is: Clear the “Media Storage” app’s data Use the SDrescan or the SD Scanner (also works on Android 4.4/5, available on F-Droid) app to force an update … Read more
Generally, I think your USB connection should be set to use MTP (Media Transfer), however, I couldn’t get my computer to recognize my device (Nexus 4). Oddly, setting the USB connection to Camera got it working for me.
I had similar situation. Here is what I did: Try to check and uncheck the USB Debugging option in the device. (if not working, try to unplug/plug the USB) At some point, the device should show up a messagebox to ask you if you authorize the computer. After you click yes, the device is then … Read more
I had a similar sounding situation with my Nexus 4. For me it was an issue with the drivers Windows was installing automatically. I followed the instructions in [Q]Computer won’t recognize phone? – Post #8. I had some slight differences on Windows 7. For me I, Uninstalled the driver from Device Manager Let it automatically install … Read more