Did it crash?
If not, no files are supposed to be there.
But even if it did crash, there could be reasons why there are no files. Particularly when it crashed while it was saving.
Please do
- save your files
- save early
- save often
- save different versions of your file. Because it doesn't help if you save every 5 minutes and then the only copy of your file gets corrupted.
- save to multiple locations
- turn on Time Machine if on a Mac
- turn on the Recovery function. But never rely on it as your only solution.
- turn off "Save in background" in the Illustrator preferences.
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