iCloud periodically saves versions of the files stored on iCloud Drive. If your presentation is saved on iCloud Drive and you want to return to a previous version of it (for example, because you deleted content you decide you still need), you can restore an earlier version.
With the presentation manager in browse view, tap Select at the top of the screen, then tap the presentation (a checkmark appears).
Tap Versions at the top of the screen.
Tap a previous version to select it.
Tap Preview.
Keynote displays the version. You can search for text in the preview, and you can copy text and objects. However, you can’t edit in the preview.
Do one of the following:
Save a copy of the version shown in the preview: Tap Save a Copy.
Keynote opens the copy as a new presentation for you to edit. (The original version is available in the presentation manager, where the copied version also appears.)
Replace the current version with the preview version: Tap Restore.
Close the preview and return to the current version: Tap Close.
Note: If the presentation is shared with others, anyone with editing permission can copy and restore only the versions created after you shared the presentation. Anyone with View Only permission has no access to earlier versions.
If you add a password to a presentation, or change an existing password, the password applies only to the version where the password was added or changed and to subsequent versions.
If the presentation is shared, to prevent others from restoring an unprotected version of the presentation or a version with an older password, stop sharing the presentation, add a unique password to it, then share the presentation again.