## Description
Tweaks to Upload and Dropzone components, making them more extendable.
- Dropzone adds prop to allow multiple files
- Upload correctly sets url if state is initialized with a File
- [x] I have read and understand the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository.
## Type of change
- [x] Chore (non-breaking change which does not add functionality)
## Checklist:
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] Existing test suite passes locally with my changes
- [ ] I have made corresponding changes to the documentation
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