Does DOI have to be written as a URL?

The more important point is consistency and alignment with your school or journal requirement. Do not mix multiple DOI styles in one paper.

Should I keep both DOI and the webpage link?

Usually not unless your target format explicitly asks for both. Otherwise the line may become repetitive and inconsistent.

What if Zotero exports DOI in a style different from my template?

Do not rebuild the whole reference list. First normalize the DOI style, then adjust the citation style or export rules if needed.

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How to Format DOI in References | Placement, Consistency, and GB/T 7714 Pitfalls

This guide explains how to format DOI in references, especially when DOI placement is inconsistent, mixed with URLs, or exported unevenly from Zotero.

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This guide explains how to format DOI in references, especially when DOI placement is inconsistent, mixed with URLs, or exported unevenly from Zotero.