Reduce Image Quality after upload?

Hi,
is it possible to reduce the image quality after it was uploaded to save storage?
Some of my users upload photos with over 10MB.
Maybe it’s possible with the previewgenerator?
Thanks!

As the name says, “previews” only impacts previews, not original files, but it might be possible that the Workflow external scripts app is what you’re looking for.

The solution for this problem is here