(on. 003 firmware) Today i took some footage and accidentally switched off the mini without stopping the recording. I copied the file to PC which then said it was corrupt.

i means  short recording on the Mini and stopped the recording before switching off the Mini

Hi. I am sorry for the trouble this has caused. With regards to this issue. Before shutting down the drone please stop the recording to make sure that videos are properly saved. However, If issue still persists please refresh the firmware of your DJI Mavic Mini to isolate the issue. Please keep us posted for further assistance. Thank you.