No, you must create a new name for each file used for Simlive. Our system will cache the video file that you previously used, and if the name is the same, it won’t drop the old cached file and replace with the new. It will use the old file instead. Please name the new file differently to avoid such problems.
We recommend adding the date to your filename to avoid conflicts.
For example: You could name your file "2017_01_20_message.mp4" instead of just "message.mp4". This would prevent conflicts from arising from your video names.