Inexplicable gradient in PDF exported from Canva

[AlphaSnowLion]

I have a PDF that was exported from Canva. There's a gradient that goes from left to right, fully opaque to fully transparent. I wanted to check something in the PDF when I noticed this strange gradient that doesn't seem like anything I've seen before

As you can see on the footage, it's not an actual gradient style, it's fully scalable so it's not a linked image, not a mesh, not a symbol etc. I can't for the life of me figure out what I'm looking at, or find anything about this pehnomenom. But I want to know what the hell this is lol. When I have this object selected and then create a new path, this object's gradient properties are copied to the new object in a repeating pattern, including its size and rotation. Also notice how the color picker displays a thin gradient line rather than what a normal gradient would appear here, or a solid color

So what is this mystical gradient/object? Is this something I can create from scratch, or just an anomaly from Canva?

[Monika Gause]

Could be an unnamed pattern - maybe containing a pixel image. Can you open the swatches panel?

[AlphaSnowLion]

There's nothing in Swatches. Forgot to include this window in the video

[Ton Frederiks]

What does it show as a fill in the Swatches panel?

[AlphaSnowLion]

Nothing that I can find

[Ton Frederiks]

And if you add the fill to the swatches?

[AlphaSnowLion · Accepted solution]

Good call! Trying to add it gave away the situation: it was a pattern. Going into [Object --> Pattern --> Edit Pattern] made me aware that it's a simple gradient fill in a retangle, turned into a pattern. I haven't worked with patterns yet, so this was totally new to me. Thanks guys!