Only those models you published on Thingiverse can be imported. (stl, obj, ply, off, 3mf, 3ds, wrl, dae model file formats are all supported).
Copy the URL of your Creality Cloud profile and paste it in your Thingiverse bio, so we verify that it's you.
Visit https://accounts.thingiverse.com and sign in to your Thingiverse account.
Click on your Thingiverse avatar and choose "View Profile".
On the new page, click on "Edit Profile".
Choose "MAKERBOT ACCOUNT" and your username will be showed below.
Choose "THINGIVERSE SETTINGS" and paste your Creality Cloud profile URL in Bio.