How to add a recording to an existing song project

Click the orange + button in your catalog.
Click Add recordings...
Select the source you'd like to upload a recording from - your options are your Computer, Spotify, SoundCloud, YouTube, and Box. You can also select recordings that you've already uploaded from your Catalog.
Once the recording is finished processing and uploading, click Continue.
Select the recording by clicking on it in the modal.
Click the Add to existing song button.
In the Select songs* field, type in the name of the song you want to add the recording to.
Select the song in the search results.
Click Save.
Click Add Recordings.
Click Done.

How to combine recordings within the bulk uploader to be associated to the same song

Click the orange + button in your catalog.
Click Add recordings...
Select the source you'd like to upload recordings from - your options are your Computer, Spotify, SoundCloud, YouTube, and Box. You can also select recordings that you've already uploaded from your Catalog.
Once the recordings are finished processing and uploading, click Continue.
Select the recordings by command+clicking them in the modal.
Click the Add to existing song button.
In the Select songs* field, type in the name of the song you want to add the recordings to.
Select the song in the search results OR click Create to create a new song.
Click Save.
Click Add Recordings.
Click Done.

Click the orange + button in your catalog.
Click Add recordings...
Select the source you'd like to upload a recording from - your options are your Computer, Spotify, SoundCloud, YouTube, and Box. You can also select recordings that you've already uploaded from your Catalog.
Once the recording is finished processing and uploading, click Continue.
Scroll to the right within the Recording Importer until you see the Release Title field.
Hover over Add Release Title in that recording's row and click the edit pencil.
Type the Release Title into the Release title field.
Click Save.

Note: the Release Title you enter here must match the Release Title that exists in your catalog.

Click the orange + button in your catalog.
Click Add recordings...
Select the source you'd like to upload recordings from - your options are your Computer, Spotify, SoundCloud, YouTube, and Box. You can also select recordings that you've already uploaded from your Catalog.
Once the recordings are finished processing and uploading, click Continue.
Select the recordings by command+clicking them in the modal.
Click the Edit common fields button above.
In the Release Title field, enter the name of the Release.
Click Done.

Click the orange + button in your catalog.
Click Add recordings…
Search for and select the recording(s) that you've already uploaded from your Catalog.
Click Continue.