[Bug]: Pasting images from local tldraw to other tldraw is flaky/slow/weird
### What happened?

Steps to reproduce:

1. add a handful of images to a local tldraw document (e.g. go to https://tldraw.com)
2. select and copy the images
3. create a new tldraw document (either local or remote) in an incognito window
4. paste the images

### How can we reproduce the bug?

_No response_

### What browsers are you seeing the problem on?

_No response_

### Where did this happen?

The tldraw.com website

### Contact Details

_No response_

### Code of Conduct

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