You can open the OneDrive upload dialog via one of the following methods:
Once reaching the OneDrive upload dialog, you can choose assorted settings that will be applied to the uploaded video. After making your selections click on Link to Microsoft OneDrive..., this will open the Microsoft Authentication dialog.
Once the Authentication dialog appears, login to your Microsoft Account if required, and follow the prompts to allow the application to access your online profile.
After authentication is complete, you can click the Upload button to commence the conversion (if required) and upload process.
If the upload process to OneDrive fails, please check Troubleshooting OneDrive.