Thanks, mixture, I'll look at Flicker tonight. Sounds promising.
I had a bit of a struggle with dropbox last night. Probably part of the trouble was me, but it did seem reluctant to say, Okay, you've loaded me, now stop trying to bloody reinstall me. Just a loop back to install every time.
Anyway, I dragged files to the folder and struggled on with my aged Android. (Sounds like something for piles.) They were there, and the full size, but I haven't discovered a way of checking the size on my phone.
Talking of phones. They've moved on a bit, haven't they? I watched a long video of the Norfolk broads this week. All taken, hand held, on a professional cameraman's phone. Difficult to see the difference from the Beeb. Bewildering.