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Version History, with the option to rollback to about any state (having limited states is better than nothing to me, ideally unlimited, but being able to delete certain versions might work out well, too.)
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Being able to embed Dynalist in a document
This would could be tricky, as you would need others to sign up for Dynalist, if they cannot edit the document.
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Who edited what and when.
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Allowing anyone with a link that’s singed into Dynalist to edit the document.
This might cost extra, since multiple copies would have to be saved and due to any increased server load.
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A way to pay for image hosting, so that way contributors can easily upload things as needed. With a standard rate + additional fees for bandwidth and hosting that are adjusted every month.
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Custom domain name support, although one could simply redirect to the Dynalist, lol.
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A getting started guide for those new to collaboration.