I use postimage.org and usually upload images in 800x600 format which is supposedly the best size for a 15" monitor.
I think, any larger and they would fall off the edge of a tablet.
I'll have a go at attempting something a bit bigger and send it as an attachment in a PM.
ETA Dammit! Just realised that I can't send attachments in a PM.
Will have to do it by postimage.org once again.
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