File Upload Field gets cleared when Stripe requests a 3D Authentication

[andrewlimaza]

Describe the bug
When a Stripe checkout requires 3D Secure/Authentication. The uploaded file fields are emptied and checkout is processed.

PS - Only tested with Stripe Connect. Assume it's happening on legacy Stripe method as well.

To Reproduce
Steps to reproduce the behavior:

1. Install latest Paid Memberships Pro version and setup your payment gateway to Stripe.
2. Add a file type of field.
3. Navigate to checkout and complete the required fields, upload a file to your custom field.
4. Test checkout that requires 3D Secure. Approve the authentication (in sandbox).
5. Complete checkout, navigate to your edit profile page. Fields are empty.

Expected behavior
Upload fields should stay assigned to the upload button and processed.

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only Paid Memberships Pro plugin is active.
• This bug happens with a default WordPress theme active, or Memberlite.
• I can reproduce this bug consistently using the steps above.

[michaelbeil]

A member reported this in ticket 368369 (moderators only).

[andrewlimaza]

A temporary fix that may work, until this gets resolved may be to use Stripe Checkout - https://www.paidmembershipspro.com/gateway/stripe/stripe-checkout/

Alternatively, let member's upload files later from their membership account/profile page.