Unfortunately, the answer is you cannot (only N3V can do that, and they will not normally do so unless it's a copyright issue). However, you can release an update to it by right-clicking the asset in Content Manager and using Create New Version, then work on the new version of the asset (which can be committed and uploaded in the same way - the only difference is that it will become a kuid2 asset with :1 at the end).
Shane