Since you already know that the release is in the database, you should do the following:
- Load the folder with the music files into Picard
- Cluster the tracks
- Right click on the cluster and select “Lookup in Browser”
- Find your release via search (since you told us you already found it before)
- Press the green “Tagger” button on the right which loads the release into Picard
- Manually drag & drop the cluster with your files from the left pane into the release that you just loaded in Picard that is in the right pane
- Press save on your files
And because you couldn’t match your files with Scan, it means that the tracks don’t have AcoustIDs attached to them in the database. You could submit them into the database as well. This is how to do it:
- Drag & drop the release from the right pane back to the “Clusters” folder in the left pane (or load it again + cluster if you already removed it)
- Press “Scan” and wait a couple of seconds for the Fingerprints to be generated
- Drag & drop the cluster back into the release in the right pane (you can also use Lookup if you already tagged your files to test if they are matched properly now)
- Press the “Submit AcoustIDs” button