I don’t know, sorry—I am not that familiar with the tools for composing LW posts. But hopefully this information will help someone from LW tell you the right thing to do? All I know is, if you can get the image hosted by LW and not by Twitter, it will fix the problem.
Does this mean I need to always use snipping tool rather than copy image, or will that somehow also not work?
I don’t know, sorry—I am not that familiar with the tools for composing LW posts. But hopefully this information will help someone from LW tell you the right thing to do? All I know is, if you can get the image hosted by LW and not by Twitter, it will fix the problem.