acc recorder menu is not working well on bangle1. On bangle2 one typically navigates the menu with touch and then stops with button. On bangle1 one typically navigates the menu with button and very often this start is immediatly recognised as stop.
since download takes a while I didn't wait and later on mixed up the files first. So in addition to go from file number to date/time as filename as already discussed in some thread (for recorder app though, but thats equally valid for all recorders) one can think of inlcuding the 4hex name of the device also in the filename. That would make very clear what recording that is also after download.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
By the way: doing that experiment I found