To upload a single before an album, you can follow these steps:

1. Release the Single: First, distribute and release the single as a standalone track. When releasing the single, ensure that you provide all the necessary information, including the audio file, rights data, and ISRC (if you have one) for the single.
2. Use the Same Information: When you're ready to release the full album that includes the single, make sure to use the exact same information, audio file, and ISRC code for the single as it appeared when released separately. This consistency is crucial for ensuring that the single on the album is recognized as the same track by streaming platforms.
3. Different UPC Code: The only difference when releasing the single as part of the album will be the UPC (Universal Product Code) code. Each release, whether it's a single or an album, typically has its own unique UPC code. Ensure that you allow Unchained Music to assign a new UPC code to the release by clicking "assign one for me".