Hi@autopot , thank you for contacting us.
Please mind that the UPS API the plugin is currently using limits the max package dimensions and weight for the available UPS services. According to the information at UPS official website these limitations are:
- Packages can be up to 150 lbs (70 kg).
- Packages can be up to 165 inches (400 cm) in length and girth combined.
- Packages can be up to 108 inches (274 cm) in length.
- Packages that weigh more than 31.5 kg (25 kg within the EU) require a special heavy-package label.
If the single products you are selling exceed the max weight and/or dimensions described above, they are automatically classified as freight, which unfortunately is not supported yet, since it requires using a completely different API.
Best regards
Karolina