Your Parts in Files
Parts are ordinary files you can keep anywhere the Files app reaches.
Where they are
New Parts are saved in On My iPad › MakerSketch in the Files app. They save as you work. You can move them to iCloud Drive or any other location in Files, and open them from there.
capture: the Files app at On My iPad › MakerSketchRename and duplicate
Tap the Part's name at the top left. Rename… and Duplicate are in that menu. A duplicate lands in the same folder.
capture: the Part name menu with Rename… and DuplicateDrawings
DXF files from Files open as 2D drawings and save back as DXF.
Stuck in the app?
In a project, tap Show me on the coach card to watch the step played out. Support has an email address if that doesn't do it.