If you've already uploaded but the upload was interrupted (leading to only part of the game being online), you can continue the upload.
For play-based sports like football, baseball, or softball, if you were uploading a 'Clipped' match you can continue the upload from where it left off; you don't need to re-upload the whole thing. If you were uploading a 'Continuous' video, you must re-upload all files.
For flow-based sports like soccer, hockey, basketball, or volleyball, you'll need to select all of the files and angles for the game and re-upload.
Select the playlist you're looking to re-upload, and choose the "upload" box to the right of the playlist title.