For beginners, saving a DAE 3D model involves exporting your project as a Collada (.dae) file from 3D software (e.g., Blender, SketchUp).
Open your model in the software, go to the “File” menu, select “Export” (or “Save As”), choose “Collada (.dae)” from the format list, adjust basic settings (like including textures if needed), and click “Export” or “Save.”
Stick to default settings if you’re new—verify the file by opening it in a free viewer like MeshLab to ensure it loads correctly.