Allow Auto Upload to use single-dated folders YYYY-mm-dd

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**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**
Currently, auto upload options are `YYYY`, `YYYY/MM`, or `YYYY/MM/DD`. I'd like to see `YYYY-MM-DD`.

For example, it would upload to `/InstantUpload/2025-11-08/IMG-0000.jpg`

**Describe alternatives you've considered**
Currently I'm using `YYYY/MM`, but I don't like the double subdirectories. Triple (`YYYY/MM/DD`) would be even worse.

**Additional context**