Unable to edit JPEG Asset

You might try Select > Color Range and experiment with "fuzziness" to select and extract the scrolls. If the resolution of the image is high enough, it might work out for you.

As you are using the JPEG file, You will need to do some Photoshop work to isolate the background and then cut out or crop the part you want to select.

Masking can be made easily, by going to “channels” and Ctrl/Command clicking one of the channels. As it is a black and white picture, I would assume all of them to have a perfect black and white image.

This selects the white part of the image.

You need to inverse the selection.

You switch to the layers panel. And you add this selection as mask.

In the image, the different sways are now on a transparent background.

You only need to select (rectangular selection is OK here) and copy and paste them where you need them.

If you have Illustrator, however, you should download the Illustrator file. Select a sway in Illustrator and copy past into Photoshop as a smart object. That will ensure that you can scale the asset to any size you want, without loss of resolution/detail.

If the asset downloads as EPS, you should also load that EPS file into Photoshop instead of the JPEG file. The detail resolution will be better.

As a side note: This is a Photoshop/Illustrator question, less a stock question. I do not know your level of knowledge in Photoshop/Illustrator, but I suspect that you are a beginner. If you need further advice, I will move this to the Photoshop forum for a better pool of experts.