Delay drag 'n drop Submit button

Captivate 2017

I have a drag 'n drop interaction using Object Actions so that wrong answers bounce back. Using this approach ultimately makes the user drag the responses correctly. Here's the rub - the submit button shows up at the beginning of the interaction and will go to the next slide when clicked (at any time). I want the submit button to appear only when all choices have been placed. Please show me how to do this! Thanks

Smiles,

Susann