Hello @prufessuer ...
I'm not sure if you can delete those or not. (In my own testing of my sandbox course, I wasn't able to find a way to delete attached files when added to submission comments...as you've shown in your screenshot.) If you don't see an icon to delete the files, my guess is that you cannot. As far as who can view those files...that is only between you and your instructor for that particular submission. No other classmates can see your conversation between you and your instructor. Grades are only viewable between you and your instructor. It would be a violation of FERPA if other students were allowed to see your grades.
I hope this will be of some help to you. Sing out if you have any other questions. Take care, stay safe, and be well.
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