rtx pbr packs not working on realms

I recently downloaded a couple of pbr packs to use on my realm as i dislike the NVIDIA selected ones, however the specific one i want: Truly Vanilla RTX,  does not work on my realm but works on regular worlds. As you can see in an attached image it says; '' some of the selected content could not be applied''. Another pack called; 'Kelly's Rtx works on my realm but does not have a glass texture that i like.  Because of this i tried removing the glass textures from Kelly's pack and swapping them with the glass textures from Truly Vanilla RTX. however this caused the glass textures to not be textured. i would really appreciate if this can be fixed.