What does YouTube document for creating Shorts (length, resolution, title limit) and how did Shorts view counting change on 31 March 2025?

Problem: knowing the platform constraints and metric definitions before cutting or measuring a Short. Conditions: YouTube app Shorts camera or uploading a vertical video. Method (documented): Shorts can be up to 3 minutes long; maximum upload resolution is 1080p; the title field allows up to 100 characters; privacy defaults to private for creators aged 13-17 and public for adults; drafts can be saved. From 3/31/2025 a Short view counts every start or replay with no minimum watch time; the older metric is kept as 'Engaged views' so creators can compare Shorts, and Partner Program eligibility and Shorts revenue share stay based on engaged Shorts views. Example/contrast: a later notice on the content-performance page (see C3-B573-05) says views are counted at play start in all formats from 24 August 2026. Failure modes: comparing raw Shorts views before and after March 2025 as if they measured the same thing; assuming a high view count means viewers stayed. Limitations: the fetched page documents no safe zone, no aspect-ratio table and no best-practice guidance on hooks or pacing (the search for a YouTube-published Shorts safe-zone page found only third-party guides, which disagree); the 'vertical' upload steps are procedural. Version/date: help page read 2026-10-23. Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources. Limitations: No official safe-zone or composition guidance was found in this round; third-party values (for example 35% bottom margin) are not recorded. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://support.google.com/youtube/answer/10059070?hl=en",
      "note": "Changes to Shorts views count; Create > Upload note; Intro"
    }
  ]
}