Organizing playlists into folders
Folders group playlists on the Playlists page — a place to put a release's worth of playlists, or anything else you want out of the flat list.
They're team-shared: every project member sees the same set of folders, and can create, rename, delete, and file playlists into them.
Creating, renaming, and deleting a folder
Click New folder at the top of your project's Playlists tab and give it a name. Any project member can create a folder.
To rename or delete one, open its three-dot menu and choose Rename or Delete folder. Deleting asks you to confirm first. Any project member can rename or delete any folder — a folder isn't owned by whoever created it.
Note: deleting a folder does not delete the playlists inside it. They move back to "Not in a folder" — nothing is lost.
Folders start collapsed. Click a folder's header to expand or collapse it — Dosido remembers your choice, per folder and per account.

Filing and removing playlists
Drag a playlist onto a folder to file it there — grab it anywhere on its row, no handle to aim for. As you drag, the playlist stays dimmed in place and the folder you're about to drop into lights up. Or open the three-dot menu on the playlist's row and choose Move to folder… to pick from a list — including Not in a folder, which removes it from whichever folder it's in.
A playlist lives in one folder at a time. Filing it into a new folder moves it out of the old one — folders aren't tags. Moving a playlist between folders is just organizing — it doesn't change the playlist's "Updated" time.
In the Custom Order sort you can also drag playlists to arrange them by hand — the same grab-the-row gesture, with a glowing line showing exactly where each one will land. Switch to Title or Last Updated and playlists fall into that order automatically (folders always stay grouped at the top).
You can file or remove any playlist on the project. Filing is different from editing — you don't need to be able to edit a playlist to move it into a folder (see Creating a playlist, and who can edit it).