A scan analyzes your source folders and flags files that will cause problems during migration. You have to run one before every migration — CloudMove enforces this.
Before Start Scan is enabled, the project needs:
If any of these are missing, the button is disabled with a tooltip explaining what's needed.
In the project Scan step, click Start Scan.

The agent picks up the signal on its next heartbeat (so up to 30 seconds) and begins walking the source folders. You'll see a live progress bar showing files processed and current path.
Scans are fast — the agent is only reading metadata, not opening file contents. Rough guidance:
If you're on a slow file share or a spinning disk with deep nesting, expect the high end.
Click Cancel Scan at any time.

The agent stops on the next heartbeat. Partial results aren't saved — you'll need to start a fresh scan when you're ready.
When the scan completes, review the results. See Understanding Scan Results.