LuisSanchez opened a new pull request, #37791:
URL: https://github.com/apache/superset/pull/37791
### SUMMARY
Improve file uploader UI and UX
Added the following:
- **Onboarding tour**: 5-step driver.js tour (file drop zone → preview →
database → table name → Upload) with type-specific data-tour IDs (csv, excel,
columnar).
- **Tour trigger**: “?” icon next to the modal title starts the tour.
- **Data preview**: “Preview data” button for CSV/Excel opens a modal with
client-side parsing (no Parquet preview).
- **5MB preview limit**: For files > 5MB:
- Disables “Preview data”.
- Skips column metadata API calls.
- Shows “Preview is not available for files larger than 5MB” in the
columns section.
- Fixed “Uploading a file is required” after selecting a file (correct
validation via fileListRef).
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
#### AFTER
https://github.com/user-attachments/assets/7f70315e-c3ff-43ad-b6f0-9b496e53d0f8
### TESTING INSTRUCTIONS
1. Go to "+" icon.
2. Click on Upload CSV or Excel to database.
3. For the Tour, click on the "?" icon.
4. To add a new file drag and drop it into the section for uploading files.
5. To preview the data, click on the "Preview data" button.
### ADDITIONAL INFORMATION
<!--- Check any relevant boxes with "x" -->
<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
- [ ] Has associated issue:
- [ ] Required feature flags:
- [ ] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [ ] Introduces new feature or API
- [ ] Removes existing feature or API
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