Aaron Bach e61da2fff3 Re-add ability to use remote files (by URL) in Slack messages (#37161) ... * Re-add remote file support for Slack * More work * Ensure Slack can only upload files from whitelisted directories * Cleanup * Finish work * Code review * Messing around * Final cleanup * Add comment explaining why we use aiohttp for remote files * Typo		2020-07-10 16:07:44 -06:00
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