Force file upload if customer selects "X"?

I have a membership form which is generally working fine.  However, the form is intended for use by both existing members renewing & also new members.  We generate ID cards for our members so obviously have a database of photo's for our existing members but need new members to upload photo's.

Currently my form is set with an "Upload Image" option.  It also has a dropdown selection where a member selects whether they are a new or existing member.

What I need, is when a member selects "New Member", that they are then forced to upload an image before moving to the next page but if "Existing Member" is selected, they can continue without uploading an image.

Can this be done?

This is possible with conditional logic, but dropdowns within payment fields are not supported.

You will need to use a regular field or a product without additional options.

Example based on a regular dropdown field:

If you need any further assistance, please let us know.

That looks like something I can use.  Thanks for your help.