Thanks for the reply! There's a warning that says event.returnValue is deprecated. Please use the standard event.preventDefault() instead but does not give a line number. The rest of the items are suggestions related to Gravity Forms' use of the term dpi:
Consider using 'dppx' units instead of 'dpi', as in CSS 'dpi' means dots-per-CSS-inch, not dots-per-physical-inch, so does not correspond to the actual 'dpi' of a screen. In media query expression: print, not all, (-webkit-min-device-pixel-ratio: 1.25), (min-resolution: 120dpi)
There's no specific console error when I click the 'Add Attachment' button. Thoughts?