I wanted to ask how the save slots are handled? Can savelist have holes? For example there is a savefile in slot 1 and in slot 3, but the slot 2 is empty. What happens if I try to overwrite a save slot that is empty or load from an empty one? if I delete a save do the rest of the save files that come afterwards shift back?
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However, you can uncheck this box and leave it to the various Save Actions to fine-tune exactly what you want to do: you can delete specific slots, save/overwrite in specific slots, and so on. The system should be pretty stable, so e.g. loading an empty slot simply won't do anything.
You can also set a SavesList menu element to only display a specific slot number - this way, you can arrange e.g. 5 in a column, each showing slot 1,2,3,4,5. If 1,2,4,5 are filled, then slot 3 will be shown as empty.
Custom save handling like this is a pretty advanced topic, but a relatively simple introduction to it can be found in this tutorial.