Turning a Single Source Footnote into a Multiple Sources Footnote

If I have a Zotero footnote in Word with a single source and later decide that I want to add some additional corroborating sources to it, it doesn't seem that I am able without losing all of my existing single source content. Or am I just missing something?

I'd think that clicking the "Multiple Sources" button when editing a "Single Source" footnote would retain the current source along with its Prefix and Suffix material, but it doesn't—at least not for me.

Can anyone confirm this behavior? If so, I'd like to request that this be corrected.

Thanks.
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