Mesh missing from Animation Blueprint, ow do I Re-attach

How do I reattach/target a mesh to my Animation Blueprint (A.B.)? The mesh is no longer showing in my A.B I tried updating my mesh and I had massive issues with referencing, no chance for updating and only allowed deleting which went wrong.

How do I re add it so I don’t have to recreate a new A.B.

What do you mean by re-attach? Did you delete the original mesh and then reimport it and now the animbp doesn’t recognize it?