At this time (or by doing other operation in ‘Static Image Export in Python’), is the image (or other data) saved somewhere other than our local environment (ex. https://plot.ly/~{Username})?
As it turns out, we released version 3.2.0 yesterday which now supports saving figures to images fully offline (so no data is sent over the network, and you don’t need to use a plot.ly account). The page at the location you linked above now includes the new offline instructions.