It stalls and times out at an arbitrary upload percentage like 63%, even though it had uploaded fairly quickly up to then (a few seconds). See below. Sometimes it will have successfully uploaded some images at the stall point; sometimes none. In this example, there was no image successfully uploaded out of the five I selected, despite it saying upload is 63% complete. (I recognize that the 63% figure may be phony, as some coders display faux download percentages / hourglasses / download bars so that users feel progress is being made and don’t cancel download prematurely.)
