I'm trying to install an app from an apk file, and I've moved it to my phone via USB; however, I cannot locate it.  What would be an easy location to which I could move the apk file such that it would be simple to find via a file browser?

This is what I'm looking at in USB on my PC.


![All the directories and files shown on PC (shown in this image).][1]

I search for the directories shown in my file browsers, like acct, cache, config, d, data, dev, etc, mnt, proc, ...  None of these can be found on my PC.  I search for the PC directories on the phone, and I can't find them.  So, where can I find an overlapping directory?

I'm on 4.2.1 HM2013002 (China Unicom).  China Mobile MIMU, model 2013022.

Alternatively, as a workaround, might somebody be able to post an Android Enthusiast-local tutorial describing how to remotely install an app?
  [1]: https://i.sstatic.net/DPT7E.png