I usually drag and drop my files from my folder(s) to edit videos, but this time, when I dragged and dropped like usual, this message displayed:
Error 0x1000: no streams found during init
I will however say that I converted the file from a .webm file to a .mp4 file (by replacing .webm on the end with .mp4), and that might have something to do with this problem, although I would still appreciate the answer very much.
Thank you for your time.