A couple of questions about the recent uploads API

You’ll want mp-destination. From Posting API:

For users who have multiple microblogs configured, /micropub?q=config will return of the list of sites. You can post to a specific microblog by passing an mp-destination parameter of the URL ( uid from the configured list).

So, that might look something like this in your case: https://micro.blog/micropub/media?q=source&mp-destination=https%3A%2F%2Fsamgrover.micro.blog%2F.

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