I. Function Introduction:

In order to protect the copyright of the models, models that have not been authorized by the creator cannot be saved. Models are divided into valid models and invalid models. Valid models can be directly saved and used.

(1) Valid models: models that individuals have the right to use, including platform models, personal uploads, models authorized by enterprises, models uploaded by stores, and models applied by enterprises from other institutions;

(2) Invalid models: models where 3D is not enabled (is3D=0), or deleted (isdelete=1), models that the affiliated institution has not authorized for individual use, and models that the affiliated tenant has not been authorized for use by other institutions (such as models from circles,etc.).

II. Graphic and Text Operating Steps:

(1) Single-item collection: Valid models show the collection button → Can be saved; Invalid models → Cannot be saved;

(2) Combined collection: The collection button is displayed. If all the models in the combination are valid → Can be saved; If the combination contains one or more invalid models → Valid models in the combination can be saved.