I’m just brainstorming. There is a mouse click option for ‘left click down’ and ‘left click up’ so you should theoretically, if you knew the coordinates or can reference the elements, click down on the File and drag to the UI element on the web page, then ‘click up’. But I have never tried it.
another alternative to the first idea would be click on text on screen (OCR), but I typically don’t recommend OCR because it was slow and unreliable with the Tesseract engine. However, the latest update has the Windows OCR engine, and maybe you will have better luck. I haven’t been able to test it.
best of luck!