How to fix: Performance Max asset groups missing video
TL;DR
Your Performance Max asset group has no video uploaded — which does not mean PMax stops showing video ads. It means Google silently auto-generates a slideshow video from your images and headlines, adds a robotic text-to-speech voiceover, and serves it on YouTube, Shorts, and Discover under your brand name. This article walks through diagnosing the gap, uploading at least one brand-aligned video per asset group, and covering the three placement-critical lengths (6s, 15s, 30s) needed for "Excellent" Ad Strength.
Why it matters
Performance Max requires at least one video asset per asset group to fully qualify for YouTube In-Stream, Shorts, Discover, and Gmail inventory. When no video is uploaded, Google does not skip the placement — instead, the platform synthesizes a video on the fly from whatever images and text it finds in the asset group, layered with stock TTS narration [1]. That auto-generated video runs under your brand, often with mismatched pacing, awkward voice cadence, and visuals stitched in an order Google chose, not you.
The mechanism is twofold. First, an auto-generated slideshow video reliably underperforms a brand-supplied video in view-through rate and CTR because viewers can spot the generic format within two seconds, which inflates CPM as Google must serve more impressions to hit the same conversion volume. Second, Ad Strength stays stuck at "Poor" or "Average" when video is absent, and PMax uses Ad Strength as a serving-quality signal — lower Ad Strength reduces the share of premium YouTube and Discover inventory the campaign sees [2].
The 2024 PMax asset minimum is explicit: 1 video, 5 images, 5 logos, 5 short headlines, 5 long headlines, 5 descriptions, 5 sitelinks. Missing video is the single most common cause of "Average" Ad Strength in PMax accounts that otherwise have rich text and image inventories — and the fix is straightforward.
How to fix
1. Identify which asset groups are missing video
Open the affected Performance Max campaign. Navigate to Campaigns, select the PMax campaign, then open Asset groups. Each asset group card shows a count for Videos. Any count below 1 is the gap.
If you have multiple asset groups (e.g. split by product category or audience signal), audit each one separately — Ad Strength is computed per asset group, not per campaign.
2. Prepare brand-aligned video before uploading
Quality matters here more than quantity. The auto-generated alternative is the floor, not the bar to clear. Plan for three placement-critical lengths:
- 6-second vertical (9:16) — required for YouTube Shorts and bumper-style placements. Punchy, single-message, brand identity in the first second.
- 15-second horizontal (16:9) — covers YouTube In-Stream skippable. Hook in the first 5 seconds before the Skip button appears.
- 30-second standard (16:9) — covers the full skippable In-Stream slot and works as a versatile default.
If you must start with one length, prioritize the 15-second horizontal — it serves the broadest mix of YouTube placements and works as a passable substitute on most other surfaces.
All videos must be uploaded to a YouTube channel before they can be added to a PMax asset group. If your brand does not yet have a channel, create one on your brand Google account and upload as unlisted (PMax accepts unlisted videos). For the related image and logo gap, see PMax asset completeness.
3. Add the video to the asset group
Open the asset group that needs video. Click Edit, scroll to the Videos section, click Add video, and paste the YouTube URL. Repeat for each length you produced — uploading multiple lengths lets PMax pick the best fit per placement instead of forcing one variant everywhere.
If Google later prompts you to enable auto-generated video at the campaign level, decline. The point of supplying your own video is to suppress the auto-generated variant, not to coexist with it. For broader Ad Strength improvement, see PMax Ad Strength.
4. Verify Ad Strength and disable auto-generated video
After upload, the Ad Strength indicator on the asset group should climb. The target is "Excellent" — but moving from "Poor" to "Good" already unlocks meaningful inventory.
At the campaign level, find the Auto-generated video setting and confirm it is disabled now that brand-supplied video is present. This step prevents Google from continuing to mix the auto-generated variant into rotation.
5. Monitor performance after the change
Smart Bidding may re-enter a brief learning phase after the asset rotation shifts — typically 7-14 days. During that window, avoid further structural changes (budget swings over 20%, target changes, additional asset uploads in bulk) so the model can stabilize on the new creative mix.
Common mistakes
Treating auto-generated video as "good enough." It is the floor Google guarantees, not the bar your brand should clear. Auto-generated TTS voice over a slideshow is recognizable within two seconds and erodes brand trust on YouTube placements.
Uploading one 30-second video and stopping. A single 30-second horizontal video covers In-Stream skippable but misses Shorts entirely, which is now a major Performance Max placement. Cover at least 6s vertical and 15s horizontal too.
Using stock library footage with no brand identity. Generic stock visuals are barely better than the auto-generated variant — viewers cannot connect the ad to your brand. Brand mark, brand colors, product or service visible in the first three seconds.
Uploading to a personal YouTube channel. PMax pulls metadata from the channel — including channel name displayed alongside the ad. Always upload to the brand channel.
Forgetting to disable the auto-generated video setting. Without explicitly disabling it, Google may continue mixing the auto-generated variant into rotation alongside your brand video, diluting the impact of the upload.
FAQ
Will PMax really run without uploaded video?
Yes — that is precisely the problem. PMax serves video ads regardless, but uses an auto-generated slideshow when no brand-supplied video exists. Most advertisers do not realize this is happening until they audit YouTube placements directly.
How many videos do I need per asset group?
The 2024 PMax minimum is 1 video. For "Excellent" Ad Strength and full placement coverage, supply at least three: 6s vertical, 15s horizontal, 30s horizontal.
Can I use the same video across multiple asset groups?
Yes. If asset groups segment by audience or product category, the same brand video can be reused — but if the asset groups represent meaningfully different value propositions, distinct creative per group typically performs better.
Does my video need to live on YouTube?
Yes. PMax only accepts videos hosted on YouTube. Unlisted uploads are accepted, so you do not need to make the video publicly discoverable on your channel.
What about vertical Shorts video — is 9:16 required?
Strongly recommended for Shorts placement, which is one of the fastest-growing PMax surfaces. Horizontal-only video still serves on Shorts but gets letterboxed, which reduces engagement.