Using Stateless & Normal forms together

Using Stateless & Normal forms together

hello

I'm trying to build a multi-page form where the first page asks the user for basic textual information. Page 2 has conditional dropdowns to pick products and their respective prices. Page 3 has a file upload field where the user can add in files.
All these 3 forms add / update the same record.

To get the multi-page form to work, stateless forms seem necessary. However stateless forms don't support file upload.
Any alternative ways to accomplish building this 3 -page form in Zoho creator?

Thanks