Outage report · Partial outage

Slack outage on Jun 16, 2026

Incident: Trouble submitting workflow forms with file attachments on Android.

SeverityPartial outage

StartedJun 16, 2026, 15:50UTC

ResolvedJun 22, 2026, 20:39UTC

Duration6d 4h

What happened

Slack reported a partial outage starting Jun 16, 2026, 15:50 UTC. It was marked resolved at Jun 22, 2026, 20:39 UTC.

The incident lasted 6d 4h from first report to resolution.
It was the 2nd longest of 10 significant outages Slack reported in the 12 months up to it.
Slack had reported 9 other partial or major outages in the 90 days before it.
7 other vendors we track reported a significant incident within 12 hours of it.

Latest update from Slack

8:50am PDT We are aware that some users on the Slack Android app are unable to submit workflow forms that contain a required file upload field. After a file is selected, the Submit button becomes disabled and the form cannot be completed. Users on Slack for iOS and Slack for web are not affected. We are actively investigating the issue and working to identify the root cause. We'll provide an update in 60 minutes or sooner if additional information becomes available. 9:48am PDT We have identified the cause of this issue and confirmed it affects a small subset of users on a single version of the Slack Android app. Users on other Android versions, iOS, and web are not affected. A fix is already available and will begin rolling out to Android users tomorrow. We will provide an update as soon as additional information becomes available. 12:38pm PDT A fix for this issue has been delivered in a new version of the Slack Android app, and rollout has now begun. Android users will start seeing th

Read Slack's official incident report ↗