Also the activity is inside an Attach window…
Is there any way to check that box? maybe even with another activity?, click activity works for clicking over the element but doesn´t check the box
if the check activity is not working try using anchor base activity and right side use the find element if any label information is there with he check box and left side you can use click activity to click the check box. please review the below thread for more guidance. try and let us know. thanks.