It's happening to me as well when I click "upload save" in the web version in latest Chrome. (have not tried download version)
I don't get the chance to select a save to upload, the game just freezes. Console error:
Unhandled Exception - Uncaught TypeError: Cannot read properties of null (reading 'click') in file https://v6p9d9t4.ssl.hwcdn.net/html/5873165/drillionaire/tph_jsClipboard.js at line 14