Pasted images lose their original file path #23801

When I paste an image into the prompt, the agent gets the image data but not the path. So if I say "copy this logo to the project" or "use this image," the agent has no idea where the original file is. It has to try to decode the base64 and save it manually, which doesn't really work.

What happens now:

Paste an image from disk → agent sees [Image 1] with raw pixel data → agent thinks "I don't have a direct file path" → tries to decode base64 and re-save the image, which breaks the workflow.

For example, I pasted an image and told the agent to copy it somewhere. It couldn't because there was no path to reference. It just got stuck trying to extract the image from the attachment instead of using the original file.

What i think should happen:

If the image came from a file on disk, the agent should know the path so it can reference or copy it directly. Not sure how it should work for screenshots or copied image data, but at least for actual files this would save a lot of hassle.

Related: #17488

PR: #23802