I can't upload my scene with Custom body-end.html

hi, how i can upload a custom html

when i tried to upload the scene it gives me this message :
you cannot upload scenes with a custom body-end.html file. Upgrade the Shapespark license or remove the file from the scene directory

Customizing the viewer using body-end.html file is a part of the HTML / JavaScript customization feature available only in the Plus and Premium plans (see: Subscription plans | Shapespark) You’d need to upgrade your plan to upload a scene containing the body-end.html file.

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oh,thank you for your help