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How to check it before you commit.
Five steps, and the useful one is the last.
Build one throwaway test page.
Download the HTML on Pro.
Open the files on your machine.
Put them on any static host.
Check what survived, then decide.
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The list to run through
Build the test page with the things your real site uses, not a blank rectangle. One image, one uploaded font, one form, one link to a second page. Then download it and answer these, in this order.
Does it open? Open whatever you get in a browser, straight from your own disk. A page that renders offline with its styling intact is a very different asset from one that needs the platform to look right.
Are the images in it, or pointed at? Cut your internet connection and reload. Anything that vanishes is being fetched from a server rather than sitting in the folder, which is a dependency you would be carrying with you.
Did the fonts come? Uploaded font files are yours, but a licence covering one platform does not automatically cover self-hosting the file elsewhere. Check the folder, then check your licence.
What happens to the form? Submit it from the copy you are hosting and see whether anything arrives. Assume it does not until proven otherwise.
One page or the whole site? Follow the link to your second page and see whether it is in the download at all.
Where this page and the app disagree, the app is right. Nothing above describes a file we have opened for you, and an afternoon of your own testing beats our word on something Siter.io has not put in writing.