I tested that the update data task in the custom project is currently only valid for the preset symbols with historical data on the server, but not for the customized data. For customized data, you can only click Reset dates in the backtest data settings under the data tab. When a project contains a large number of different symbols or different timeframes, there is no way to batch reset dates. It is recommended to add the function of customized data batch reset dates in update data task.