This page is the shortest route between something you needed and something that gets built.
Three things are more useful than anything else, and all three take about a minute to write.
A tool that misbehaved. What you gave it, what you expected, and what it did instead. The file type and roughly how big it was usually explains a bug on its own — most of them turn out to be one format, or one unusually large file, that nobody had tried.
A tool that is not here. Say it in the words you would have searched for. "Something that turns a spreadsheet into a chart image" is more useful than a product name, because it says what the job is.
A tool that is here but awkward. The step where you hesitated is worth more than any compliment. Nobody who built a page can see where it is confusing.
It is read. Not triaged by a system, not scored, not answered by a template — read by someone who can change the code.
A bug with enough detail to reproduce is usually fixed within a few days, because none of these tools have a release process to wait for. A request for something new is slower and honest about it: it goes on a list, and the things several people ask for get built first.
If you left an email address you will hear back when there is something to say — a fix shipped, or a reason it will not be. If you did not, that is fine; the message still counts.
An open form on a public site receives more automated submissions than real ones within about a week. The usual defence is a CAPTCHA from Google, which means every visitor to this page would be loading Google's code and being profiled by it, on a site whose whole argument is that it does not do that.
So the form asks you to add two small numbers instead. It costs you a second, it sets no cookie, it sends nothing to anyone, and it stops the automated submissions — which are not clever, they are just numerous.