Hi Jorge,
Is the library in the image, molex 5 pin library the one you are interested in controlling? If it is that is a Fusion Team library. Where is that library stored?
Yes to the 5 pin molex. Location has been changed to library.io per your advice.
I have placed the two suspect components in library.io, per your advice. I was not aware that that was the right place.
I am a mechanical engineer, who is new to electronic within a cad environment design, forgive my ignorance to some of this. Please review my workflow, if this is sensible
I usually:
1. Identify desired component from a vendor
2. Go to Ultralibrarian to download it's footprint, and often 3d model
3. Go within library manager in Fusion to attach a separate 3d model to the footprint (as it does not have a 3d model normally attached)

4. Insert said component to schematic.
5. Manipulate in PCB document.
6. Push to 3d.
Most of the components come out fine, the 5 pin molex and diode fail. I have re-inserted them after removal, and placed in library.io, I get the same outcome, 3d model not present.
Here is a link to the files for the schematic and pcb document if you wish to manipulate it.
https://a360.co/3WzjLAM
https://a360.co/3SIcgGz
General questions:
Is there intrinsic value in having the 3d model with each component, i.e. when the overseas vendor makes the board, are they generally OK with missing a few 3d models in the design?
Is a "library" able to come in, from a website, with it's 3d model?
Thanks!