It's a commonly asked question so I'm copying this info to a new thread in hopes it will be found more easily.
The Vutu app makes .utu files. These are a plain-text, editable, JSON format containing partials maps.
In Sumu, you can import the .utu files. The import process creates .sumu files, which are compressed to save space. The import also does some more analysis and saves it in the compressed file.
To import .utu files in Sumu, click the [...] in the Partials module. There's just one choice in this Popup menu: import partials. Then select a folder to import.
When you import a partials folder, it imports the whole directory tree underneath the one you pick, including any folders that contain .utu files.
So if I have on my disk
~/VutuFiles/Strings/cello.utu
~/VutuFiles/Strings/viol.utu
~/VutuFiles/Noises/tinkle.utu
~/VutuFiles/Noises/harsh/blender.utu
and then bring up the import dialog (partials/...) and select the folder ~/VutuFiles to import,
the files
~/Music/Madrona Labs/Sumu/Partials/Strings/cello.sumu
~/Music/Madrona Labs/Sumu/Partials/Strings/cello.sumu
~/Music/Madrona Labs/Sumu/Partials/Noises/tinkle.sumu
~/Music/Madrona Labs/Sumu/Partials/Noises/harsh/blender.sumu
will be created, along with the directories on the way.
Importing again will (for now) overwrite these files.
The intention is to "sync" your entire partials development folder at once. So if you make a folder somewhere called "VutuPartialsForSumu" or something, with everything you want to import into Sumu, and always select it when you import, you will keep your partials organized based on that folder's structure.
-Randy