You can access your save states by pausing your game, then pressing either "Save State" (to create a new one) or "Load State" (to load one). You can long-press any save state to view more options.
Select "Save State" from the pause menu, then tap '+' in the top right to create a new one or tap an existing save state to overwrite it.
Select "Load State" from the pause menu, then tap the save state you want to load. You can change the ordering of your save states by tapping the arrow in the top right.
Long-press the save state you want to rename, then select "Rename".
Long-press the save state you want to delete, then select "Delete".
These are save states that Delta periodically makes in the background to prevent you from losing your progress.
These are save states explicitly made by you and can be overwritten.
These are save states explicitly made by you and can't be overwritten. You can lock any save state by long-pressing it and choosing "Lock". To unlock a locked save state, long-press it and choose "Unlock".
The Preview Save State feature in Delta allows you to choose a save state to load automatically when long-pressing a game. To change the preview state for a game, long-press one of your save states and select "Set as Preview Save State".
Once you set a preview state, you can long-press the game in your library and it will show that save state as a preview. Simply press the game screen to jump right in!