electrogram
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File uploads
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I'm not sure yet how Slack represents file uploads, compared to attachments or plain text, but we're not rendering them quite right yet.
Official slack client:

Electrogram:

I think we can use the connection to fetch the file, haven't tested it yet though.
Depending on how https://github.com/atmos/electrogram/issues/17 works, might be able to just embed the URL of the image (zuckerberg ocp in the shot above just opens that image in an external browser).