I re-sized them down with an image resizer (not sure if it's native Windows 10 or some type of add-in). They're all ~60Kb (down from a typical ~2Mb iPhone pic) so shouldn't be big. They look fine in Windows. I uploaded them through "Go Advanced" on the regular FT in Chrome. I'll try to re-post one here from my iPhone directly, to see if that does anything differently.