[Aaron Colbry]

Good question — Silviu’s project settings advice covers the technical setup. A few workflow habits that make vertical editing much less painful:

1. Frame for 9:16 from the start. If you’re repurposing horizontal footage, don’t just crop the center — reposition each shot so faces and the main action stay inside the vertical safe area. Most NLEs (VEGAS included) let you adjust position per clip.
2. Keep titles and captions inside the middle ~70% of the frame. TikTok and Reels cover the top and bottom with UI chrome (username, caption, like buttons), so anything near the edges gets hidden.
3. Burn in captions. Most viewers watch with sound off, and captioned clips consistently hold attention longer.

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[Aaron Colbry]

Hi Adam – a couple of things to check on the missing mask outline in CapCut 8 desktop:

– Make sure the V2 clip is genuinely selected (white border in the timeline) – the mask outline only renders for the selected clip in the preview. If the program monitor is zoomed or the clip sits off-canvas, the line can be out of view.

– Try deselecting and reselecting the clip, or toggling the mask off and on in the Video > Mask panel. If a mask is applied but no line appears, updating CapCut or clearing the app cache usually brings it back.

That said, for “make this clip vertical” you may not need masking at all. The simpler path in CapCut desktop:

1. Set the project aspect ratio to 9:16 (project settings > ratio).
2. Select the horizontal clip, go to Video > Basic, and scale it up until it fills the vertical frame, then drag to reposition the framing.
3. If you’d rather not crop, duplicate the clip onto the track below, scale that copy up until it fills the frame, and add a blur. That gives you the blurred full-bleed background behind the sharp horizontal clip – the standard look for this.

Hope that gets you unstuck.

[Aaron Colbry]

Good question, and your real-world test (seeing little difference) is actually pointing at the right answer. Here’s the breakdown: **Every platform re-encodes everything you upload.** There is no way to bypass compression, so the “upload 1080p so they don’t compress it” theory is a myth. The real question is: which upload gets you the *better* re-encode?
**The “upload 4K” trick and where it actually worked:** On YouTube, uploads at 1440p and above historically received the more efficient VP9 encode, while 1080p uploads often got older AVC/H.264 encodes at lower bitrates. That’s where the “upload 4K even if it’s upscaled” advice comes from, and for regular landscape YouTube videos it genuinely helped for years. But YouTube’s Shorts pipeline has changed a lot, and most Shorts now get the better codec tier regardless of upload resolution — which is exactly why your A/B test shows little difference. Trust your eyes on this one.
**TikTok and Instagram Reels:** Both crush everything down to roughly 1080×1920 no matter what you upload. A 4K upload doesn’t unlock a better codec tier there the way it once did on YouTube; it mostly means a bigger file sitting in their processing queue. And since your source is restored/upscaled 90s footage rather than native 4K detail, upscaling to 2160×3840 before upload gives their encoders no real extra information to work with.
**What matters more for your specific content:** Old interview footage has grain and noise, and noise is the #1 bitrate killer — encoders burn enormous amounts of data trying to preserve grain, which starves the actual picture of bits. Two things will improve your uploads more than the 4K-vs-1080p debate ever will:
1. Light temporal noise reduction in Resolve before export — just enough to calm the grain, not enough to look plasticky.

2. A clean, high-bitrate master file. Don’t let the bitrate starve: 16-20 Mbps is a sane target for talking-head 1080p vertical.
**Suggested Resolve Deliver settings (one master for all three platforms):** Custom Export > Format MP4, Codec H.264, Resolution 1080 x 1920, frame rate matching your timeline, Quality set to “Restrict to 20000 Kb/s”, audio AAC at 320 kbps. Upload that same file to Shorts, TikTok, and Reels.

So: stick with 1080p, stop worrying about the 4K trick for short-form, and put the effort into the denoise plus a healthy bitrate instead.