Step 1: back up
Back up the userdata remote folder before deletion, reinstall, rollback or cloud conflict repair.
Tool
Steam troubleshooting flow
Use this safe order for launch failures, black screens, crashes, controller issues and cloud save conflicts before moving to a game-specific checklist.
Step 2: verify
Use Steam file verification first instead of downloading unknown fix packs.
Step 3: isolate
Disable mods, overlays, input tools and injection utilities to build a clean baseline.
Step 4: document
Record patch, DLC, driver, Proton, crash scene and error code before changing more variables.