Slack files.upload Method

API Metadata

Provider	Slack
Status	deprecated
Deprecated announced	2024-04-09
End-of-life date	2025-11-12 0
Sources	Changelog: The files.upload method is retiring

Slack has deprecated the files.upload method in favor of a more reliable asynchronous upload system. As of May 16, 2024, newly-created apps can no longer use files.upload. Existing apps must migrate to files.getUploadURLExternal and files.completeUploadExternal by November 12, 2025.