This is not a bug. I just want to ask you where can I report bugs.mojang.com bugs?

The bug I want to report:

You can accidentally attach files to any issues reported by other people.
Steps to reproduce:
1. Try to comment on my issues(or other people's issues) with attached files.
2. Press "cancel"
3. You will notice that you've attached a file on other people's issue. You can delete it.

NOTE: The attached files below are bug reproduce
Sorry for my bad English.