I'm trying to display a preview image in a UIActivityViewController. This preview image is from a remote url so it'd require time to load. I'd like the placeholder to be empty initially to avoid blocking displaying the UIActivityViewController and then for it to display while I render the UIActivityViewController. Is it possible for the image to be generated asynchronously? From the docs I've seen on UIActivityViewController I haven't found any example of asynchronously loading the preview image. 
Is there support for presenting a UIActivityViewController with a preview image that gets loaded after the view controller is displayed?
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