What to include in a tool bug report
A useful bug report makes the problem reproducible without requiring you to send a private source file. Include the exact tool URL, browser name and version if known, operating system or device, source file type, approximate file size, the setting you selected and the message or visible behavior that appeared. If the problem happens only with one unusual file type, mention what is unusual about it without attaching confidential content.
For conversion or media problems, explain what you expected and what the downloaded file actually did. For PDF tools, page count and whether the file is encrypted are useful. For archive tools, the archive type and whether it is password protected matter. For developer tools, a short sanitized sample that reproduces the syntax or encoding issue is more useful than a complete production dataset.