You can find the build number under a question mark in the bottom-left (or upper-right, depending on the version) corner of any page in YouTrack
If you face a problem with data loss, upgrade, YouTrack failure, or performance degradation, please share full YouTrack logs. This will help us investigate the problem faster. You can upload the archive to https://uploads.youtrack.cloud and share the upload ID in the problem description.
For example, https://mycompany.youtrack.cloud. To find your YouTrack Cloud address, simply look for the URL in your browser's address bar when you're using YouTrack.
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