The theme of application previews in the app store could match the user's theme (light/dark).

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**Is your feature request related to a problem? Please describe.**
I'm very sensitive to design and color choices when choosing my digital tools. I think seeing the app preview image directly related to the user's theme would help the user to project themselves, and the app store page would generally be more consistent with the chosen theme.

**Describe the solution you'd like**
Let the application managers provide one screenshot in light theme and another in dark theme, or let them generate them automatically, and Nextcloud will automatically choose the right one, according to the user's preferences.

**Describe alternatives you've considered**
Keep the current system where each developer chooses the image they want.

**Additional context**
I don't think this feature is very important, but I do think it would be interesting!