Don't just hope it goes from loading to importing without doing anything about it.
Try the following:
1. Clean your browsers cache (browsing & download history, cookies, site data, cached images, files etc.
2. Try again. Still can't import any products? Go to step 3.
3. Clean browsers cache again.
4. Uninstall Alidropship Google Chrome Extension.
5. Install Alidropship Google Chrome Extension.
6. Add website to Alidropship Google Chrome Extension.
7. Login to website in Alidropship Google Chrome Extension.
8. Try importing again. Still not working? Go to step 9.
9. Try other browser: Opera or Brave Browser (they run Chrome Extensions)
10. Perhaps reinstall Google Chrome browser, reinstall browser and extension to test again.
11. Deactivate plugins (but not WooCommerce/Alidropship, you want to import though) & test again.
12. Try in a other PC, tablet or phone which runs Google Chrome as browser.
13. Use the direct import.
14. Try importing products in a virtual machine with Google Chrome browser.
15. Contact support.