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slack.com
Upload a file to Slack (new external upload flow)
domain:
slack.com
· 4 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps
files.upload is deprecated — use the 3-step external flow
POST files.getUploadURLExternal with filename and length to get upload_url + file_id
PUT/POST the raw bytes to upload_url
POST files.completeUploadExternal with files[{id, title}] and channel_id to share
Known gotchas
files.upload was sunset (March 2025) — code using it gets method_deprecated
completeUploadExternal needs channels or it uploads privately without sharing
length must match actual byte count exactly
Related routes
Upload and share a file via Google Drive API
google-drive · 4 steps · unrated
Send a Slack message to a channel via Web API
slack.com · 4 steps · unrated
Receive and verify Slack Events API callbacks
slack.com · 4 steps · unrated
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