How ever when I saved Ui explorer and open it again, it makes errors.
When I use test activity, it changes downloaded file name well.
but when I run the project, project stop on this step…
Can you try to remove the ctrlid line, or replace 1001 with * and validate again? It may be a dynamic selector that changes each time, so it may not be stable.
Use attach window indicating the Pop up window and use Typeinto Activity to Type the File name make sure that you enabled the Empty field in the Properties of the Type Into Activity!