Do Models have to be in GLB Format?

Also, I'cant add GLB Assets under 10MB although my project size is under 10MB :/

In your design, click on the plus sign on the left edge. There, check the box next to the word "Assets". Go to this tab and now you can drop the .

No. I still cant drop Assets, e.g with 6.8MB. Why???

For the moment there is indeed a hard limit of 5 Mb per asset.

okay thx