Yes, all libraries require stems for the tracks they accept. You have the option to upload the stems either before or after your track is accepted, but you must do so promptly.
Important Note:
- Before Acceptance: You can upload stems when you initially upload your track.
- After Acceptance: If your track is accepted and you haven't uploaded the stems yet, you need to upload them as soon as possible.
Access to Stems: Do not upload a track if you don't have easy access to the stems. Libraries depend on stems for various uses, and having them ready ensures a smooth process.
By providing stems promptly, you ensure that libraries can work with your tracks efficiently and effectively.