Select Platform
Games:
You can attach a file to your report e.g. a screenshot for graphics issues. Limit: 12 MB
To create DxDiag report press Windows key + "R", type DxDiag and click on "Save All Information..." button.
The log file is located here:
Steam: C:\Program Files (x86)\Steam\steamapps\common\The Witcher 3 REDkit\bin\editor.log
GOG: C:\Program Files (x86)\GOG Galaxy\Games\The Witcher 3 REDkit\bin\editor.log
Epic Games Store: C:\Program Files\Epic Games\TheWitcher3REDkit\bin\editor.log