Describe the bug
File with an underscore like "image_02.png" can be uploaded without being sanitized. When renaming them underscores are replaced with a dash.

Expected behavior
The same rules should apply to file names when uploading and renaming. So either "image_02.png" should be changed to "image-02.png" on upload or underscores should be allowed in filenames when renaming them.

Screenshots

Kirby Version
3.2.5