Feature Request for a more clear UI

**I'm submitting a...**

- [ ] Bug report.
- [x] Feature request.

## Feature request ##

**Describe the problem you're trying to solve.**
- As a first time user, it's initially unclear where the exported files are.
- It's unclear what kind of metadata I can add,

**Tell us which solutions you've explored, the solution you would pick, and why you think it would be the best for everyone.**
- Instead of displaying "DONE: Exported Selected Layers", write the path instead, like "Exported: C:\Users\Username\Desktop\export\layer.png"
- Add a field or a dialog to specify where to export.
- Add a button to open the folder which contains the exported file.
- Add a combo box to choose what metadata the user can add.
- Add a button that links to the documentation of this plugin.

## Other ##

**Other information**

No files or tests are named. Start by tracing the existing “DONE: Exported Selected Layers” message and export flow, then decide which proposed UI improvement is in scope. Done should include a clear exported-file location and an agreed behavior for any added destination, folder, metadata, or documentation controls.

Written by the indexing model from the issue text.