This to me seem more like a bug or a missed logic function...
I posted this on the meteobridge forum as well but here it is for the masses...
If I have an event trigger for a chart upload and I have selected to delete the file, How come is leaving behind the actual generated chart file and not deleting it properly? I know it deletes the lastchart html file but is pointless if you leave the actual generated file behind..... This will kill the SD card quicker.
See attached screenshot