Well, it depends on the parameters you chose to save a file from your browser. The operating system and browser you use also depend on this. You may simply hit + J in your browser and the download history is right in front of your browsers when you don't know which folder has your download videos from Reddit
Also, remember that you can play your video rather than download it if you use a browser other than Chrome. It's not possible. In order to resolve this problem, a simple step must be taken:
- Right-Click on the video and select the option "Save as...."
- You can now specify the place where the video is to be saved.