Thumbnail Attachment

Automatically associate custom thumbnail images with your videos using intelligent file naming detection.

How It Works

When you upload a video with a matching thumbnail image (using the _thumbnail suffix), Ads Uploader automatically links them together. This custom thumbnail will be used as the preview image for your video ad across all Meta placements, giving you control over the first impression viewers see before playing your video.

Naming Format

video_file_name.mp4
video_file_name_thumbnail.png

The thumbnail file must:

Start with the exact same base name as the video
Add _thumbnail suffix (lowercase, with underscore)
Use a supported image format

Examples

✅ Correct Naming

Video File	Thumbnail File	✓
`summer_sale.mp4`	`summer_sale_thumbnail.jpg`	Matched
`product_demo_v1.mov`	`product_demo_v1_thumbnail.png`	Matched
`ad_creative_001.mp4`	`ad_creative_001_thumbnail.webp`	Matched

❌ Won't Be Detected

Video File	Thumbnail File	Issue
`summer_sale.mp4`	`summer_thumb.jpg`	Base name doesn't match
`video1.mp4`	`video1-thumbnail.png`	Use underscore, not hyphen
`promo.mp4`	`promo_Thumbnail.jpg`	Case matters: use lowercase

Supported Formats

Video Formats

Thumbnail Formats

PNG (recommended for quality)
JPG/JPEG
WebP

Documentation