Why can't I copy files between the external & interal SD on an Android 4.2 tablet? When I insert a micro-SD card into the tablet, I can open the graphical "file manager" in the apps and view which files &amp; folders are on the internal-SD and the external-SD. However I can not discover how to copy a file from the internal to the external SD or vice-versa. The File Manager lets me create a copy of a file in the same folder, but there was no hint given as to how to copy or move a file from one folder or storage medium to another.

The tablet I am trying to work with is apparently a FAST-TOUCH (??) which is running Android 4.2.2. I think it may be this 10" tablet, or at least it is very similar to it.

I did not purchase the tablet and I definitely do not have "admin" access. I have tried to locate a user manual, but I do not think one exists. It seems to be rather common for Android devices to come with little or no useful documentation.

I would normally never bother to ask about this since I always considered simple file ops to be very trivial procedures. But I have never used an Android tablet (or phone) before and, frankly, I do not find using it to be as intuitive as I think others assume it to be.

A Note About Edits

This question previously focused on asking about documentation. I have stripped most of that out and repurposed the question to ask only about how to do a simple file copy with the File Manager on the tablet.

Before I posted the question I attempted to locate previous questions about basic Android documentation, but failed to find them. For some reason, I only seem to be able to find the questions I am looking for if I first create and post a duplicate question. 

I am posting links to the general documentation questions I found below for possible future reference since, frankly, I doubt my ability to find them again.

Where can I ask questions that aren&#39;t Android Enthusiast questions?

Where can I find a thorough introduction to Android?

Android Jelly Bean help or user manual
I use Total Commander for this kind of stuff. You can use the second button in the bottom bar to move files. 
Total Commander lets you open two locations at once, which makes copying between those locations even easier.