Please note that you might need to use Ctl+your browser's refresh button (see list below for Windows)
otherwise your browser will use its cached image.
I have tried every trick that I can find to force the cache
to refresh the image if it changes (i.e. its time stamp), but to no avail.
You can also try holding down the Shift key and pressing the F5 key; that too can work.

Browsers where clicking on only refresh works
Edge; I.Explorer; Firefox; Safari; Maxthon.

Browsers where clicking on only refresh does not work
Chrome; Opera.

These are all tested only on desktop versions. Other 'brands', versions and platforms have not been tested, so you'll have to find out by trying the options available to your system.