Output from a Copy activity After the copy activity runs completely, you can see the path of log files from the output of each Copy activity run. You can find the log files from the path: https://[your-blob-account].blob.core.windows.net/[logFilePath]/copyactivity-logs/[copy-activity-name]/[copy-activity-run-id]/[auto-generated-GUID].txt. The log files generated have the .txt extension and their data is in CSV format.

See https://learn.microsoft.com/en-us/azure/data-factory/copy-activity-log?tabs=data-factory