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Fixes #
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### What?
This PR fixes an issue with `plugin-seo` where the `MetaImageComponent`
would not allow creating a new upload document from the field.
### Why?
To allow users to upload new media documents for use as a meta image.
### How?
Threads `allowCreate` through to the underlying upload input.
Fixes#12616
Before:
After:
ede5c671b8