IDontNoWatIAm wrote:

I think you can use an extension to use assets, but I'm not sure how too without it, but there is a way using project and studio thumbnails

Copied from a previous post I made
You can upload your image to a project or studio, set it as the thumbnail, right click the thumbnail image, press open image in new tab, copy the link, and then use the img tag and paste the link. You can also increase or decrease the size of it by changing the numbers in the (number)x(number) part at the end of the link.

Additionally, changing the thumbnail of the project or studio will also change the image as seen on the forums, so you should make separate projects for each image. Also, to my knowledge, there is no way to change the dimensions of the image.

1. triple-click this code and drag it to your bookmarks bar:
   

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2. click the bookmark anywhere (on the Scratch forums) where you want to upload your image
   
3. done
   

TheGlassPenguin wrote:

1. triple-click this code and drag it to your bookmarks bar:
   

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2. click the bookmark anywhere (on the Scratch forums) where you want to upload your image
   
3. done