so I was editing my video and everything was going smoothly until I noticed a file that said BL-proxy or something like that. I had no clue what it was for so I deleted it and continued editing my video. I closed Blender when I was done for the day. The next day I opened it and the intro to my video was there, but the main clip wasn't. It just showed a blank screen and all I had done was delete that proxy file and make the shortened clips into a meta strip then edited some more and made those another 1 meta strip. I tried unmetaing them but didn't work. I don't know what to do and I couldn't find the original clip I had as I could only bring back a copy. Please help me not lose 7 hours of work.