Cannot submit; conflict with elementor pro

I cannot submit form with image uploaded. I can submit when I filled only text. (Actually, I can include and submit images in text area field.)

I turn on and off other plugins and I found that Elementor Pro has conflict. (If only Elementor, it works.)

I could submit this same form until recently, so I suspect some update make this happened.

Is there anyway to get rid of this problem? (Elementor, Elementor Pro, WP User Frontend are all latest version and essential for my site.)