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Real Slack's files.getUploadURLExternal reads image alt text from alt_txt and ignores alt_text. The emulator did the opposite. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Real Slack's
files.getUploadURLExternaltakes image alt text asalt_txt(docs) and ignoresalt_text. The emulator had it the other way around. I confirmed the real behavior with uploads to a Slack workspace.Clients still sending
alt_text, like@slack/web-api8.2.0, now lose their alt text here, as on real Slack. A fix for the SDK is proposed in slackapi/node-slack-sdk#2789.Checked by: the existing upload test, which now sends
alt_txt;tsc,eslint, and Prettier.