You probably didn't copy the path properly. If you upload to the colab, it should be like this:
View attachment 3127558
Click the 3 dots you see when you hover over the file, copy path and then paste in the input.
Doesn't seem very happy with an opus file for some reason(ffmpeg 100% support it) or I did something wrong but I'm not getting an input error.
Edit: Because I improperly demuxed it and it's a garbage file that doesn't work so that explains that.
How are you physically uploading the file? I have done it by moving the file into the frame on the left, and I have also done it by hitting the upload button then navigating its file path. Both with the same result: the file appears at the bottom of the window, not in the file list like it is in yours. And you can't copy the path. It says they are in "session storage."