Hello, I'm having a problem where I need to copy over my hda from another project every time because it is not showing up in the tab menu.

The hda is supposed to be used in material libraries. But it doesn't show up in its tab menu.

NicTanghe
But it doesn't show up in its tab menu.

most likely because it doesn't match the default Tab Menu Mask defined on Material Library node

Incase future people land here the tab menu mask is simply in the properties window and you can change it to just be *
or if you want to be more specific you can ad a part of the name of the hda file.