I do not have an Android device at hand, but ES does not seem to be showing file extensions at all, meaning that the downloaded file might not be a PLR. Try something more technical like Total Commander.
The character shows up as a blank with a red question mark (?) In the game character menu
If you are copying a character from PC, make sure to change version on the first tab to be what the mobile is (1.3.x) and not 1.4+
I'm doing it all on mobile, and I make sure it's on the 1.3.x setting.
