Thanks – good to know that it is merely a thick enough obstruction that's needed. I fear, however, damaging the screen.
I have two other queries, which I mention because they might be useful to other people too. (Arising from the fact that I've begun to use the Xodo PDF reader – owing to the fact that it has the best page cropping option, which, moreover, it will extend over the whole document).
1) A few pages back somebody had mentioned a way, in development, of changing the screen light brightness from within an app (i.e. from the header bar). Has anybody found a reliable way to do this?
2) (Arising from the unfortunate fact that the screen, quite often, does not refresh itself when using Xodo) – is there a comparable way to "force refresh" the screen? As is, I must exit to the homescreen and then rejoin xodo when the screen becomes unreadable.
Thanks!
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