Missing textures in file
It seems the textures were not packed correclty. If filepaths to the textures are complex or have non-standard characters, Blender might have problem packing these.Blender also doesn't support packing UDIM textures and therefore by now it's not possible to upload UDIM assets. Please try to pack your textures manually and after upload, try to download your asset in a new file, to see if the upload was correct.
See next articles
In this short article, we will talk about Fantasy Design. The BlenderKit team sees Fantasy Design - as a design not of a very high level. As a rule, novice designers do not have enough knowledge, but they have a great desire to do Fantasy Design.