I. Function Introduction:

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

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

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

II. Graphic and Text Operating Steps:

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

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