How does the Japanese-method digital timesheet workflow (24-frame seconds, 3-frame holds, empty cells, .xdts exchange) work, as described by a studio-method tutorial?

A CELSYS tutorial describing Nippon Animation's digital drawing method sets the timeline to 24 frames per second, reads it horizontally (unlike paper sheets) and exchanges timesheet data as .xdts between the digital timesheet editor and CLIP STUDIO PAINT (Japanese original reinspected). Curator qualifications: Empty-cell 0 rule, 3/2-frame hold entry and Toei digital timesheet platform/version details (E3-E5) not re-read line by line. English page is machine-translated (producer); cite the Japanese original. Covers only the frame-specification layer (dialogue/camera columns out of scope). Static reading only; no export run, no software installed. Limitations: Vendor tutorial. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://tips.clip-studio.com/ja-jp/articles/1370",
      "note": "tips.clip-studio.com/ja-jp/articles/1370 sections [2]-[3]"
    },
    {
      "url": "https://tips.clip-studio.com/en-us/articles/1370",
      "note": "tips.clip-studio.com/ja-jp/articles/1370 sections [2]-[3]"
    }
  ]
}