It looks like the model converter is back up and running.
Make sure you include any external files (like .png textures) along with your .dae file when you drag/drop it on the converter.
I
can import now my 3d models, but the outcomes are in .glb format. When I
insert a very simple 3d model (a box), I get the .glb file and it can be seen inside the converter box.
when
I try a more complicated model, I get a .glb file and a runtime error for a variety of the Cecium.js file (:424:15420, 450:25837 …) occurs.