Hi,
Thanks for contacting us and thanks for the detailed feedback.
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Option Field: At the moment, the Option Field supports a single selection. A multi-select option would definitely be useful for cases like products with several attributes and filtering. I will add this as a feature request.
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PDF Link: If the intention is to open/view the PDF rather than download it, the link should remain clickable when the Download option is disabled. Please let us know your SP Page Builder version and, if possible, share a screenshot or short video of the setup so we can check this behavior.
-Regards.