Try to describe the problem as best as possible, also using screenshots wherever it might help. It's best if you take screenshots of complete applications / windows, as some relevant information might be contained. Depending on the issue also project or log files will help us help you faster - you can attach up to 50MB per file, up to 10 files.
If you need to attach something over 50MB, you can use a file-sharing service like WeTransfer or Google Drive.