1. Reconnect the Google account
YouTube access runs through Google sign in, and Google is aggressive about revoking third party access after password changes, security events and inactivity. Reconnect the channel in your scheduler and re approve every permission. This is the most common fix.
2. Quotas and limits
The YouTube API allocates quota, and channels have their own posting limits, especially newer or unverified ones. Bulk scheduling a large backlog into one day is the classic trigger. Fix: space uploads out, verify the channel, and let the queue breathe.
3. The file itself
MP4 with H.264 and AAC uploads most reliably. Broken metadata from some editing tools, unusual frame rates and truncated exports all fail. For Shorts specifically, remember the hard rule: 3 minutes or under with a square or vertical ratio, or it is not a Short at all. The current Shorts spec sheet is linked below.
4. YouTube's checks
Uploads pass through copyright and policy checks, and a claim can hold or restrict a video after a seemingly successful upload. If the upload succeeded but the video is not public, open YouTube Studio and look at its status: a claim or a visibility setting is usually the answer, not the scheduler.
Uploads that confirm themselves
The worst version of this problem is silence: a video that never arrived, discovered days later. SocialPro confirms every publish with the platform after upload rather than assuming success, and fires an instant plain English alert with a one tap retry when anything fails, so a quota blip at 6am is fixed by 6:05 instead of surfacing in Friday's client report.