Sony DPT-S1 - Manual (Page 12)

Saving/Deleting Documents or Notes
An edited annotation is saved automatically.
Also, when closing a document or note,
changing the tab, etc., or after a period of
inactivity, the file is saved automatically.
Saving a document or note
Tap and hold a document/note, then
tap [Delete] from the pop-up menu. Press the (Home) button, then tap
[Documents] or [Note].
Deleting a document or note
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