Ok, thank you, Zup!
I know its not your fault, of course, as you already explained - but, sincerely, I think it is quite weird this Everyplay's approach (not allowing the user to have access to the movie file).
So, since I believe others may have the same intention of mine (that was to have access to the file just to watch it or to edit it in some way), it would be nice to warn people about this limitation, to let them choose another recording method.
Some years ago, I used a 3rd part apk to record the screen, and it worked very well on my old Galaxy S2.
I just forgot to install it on my tablet - what I will do right now.