Export your design from Polotno Studio as JSON, then paste the exported JSON directly into buildonce.app's import dialog — there's no file upload for this source, just pasted text.
{"width": 1080, "height": 1080, "pages": []...}
Import → Polotno — paste the exported JSON, then Preview design.
buildonce.app reads the Polotno document directly — text, images and shapes on every page carry over as plain editable layers. They don't become template variables automatically; mark the ones you need afterward in the studio's Properties panel.
Pasted text is capped at 2 MB, well past what any real export needs.
