I hope you are doing well. I am facing one problem in Studiox, I have tried multiple times, again and again but in the check/uncheck activity when I indicate a checkbox in UI it gives the message, the indicated target is not a valid checkbox, please use click activity instead. I have pressed F4 and tried a lot but the checkbox is not indicating.
Thanks in anticipation.
Kind Regards,

The Check/Uncheck activity only works on standard checkboxes that support the check & uncheck methods. Some checkboxes (like those on some webpages) are build using Divs, images, or other methods, and are not “actual” checkboxes.

Try the click activity, it should work, but it can only do toggle.