Having issue with white artifacts on tree branches.

I bought a nature pack from the asset store and after a while of using the assets, I noticed that they have white artifacts on the leaves. The designer replied to an e-mail and told me:

“I think it is a problem with the specular. Find the material of
branches, and change the gloss texture alpha channel to black. Maybe
it will help”

However, I’m not sure how I change a “gloss texture alpha channel”. In fact I’m not even sure what it is. Does anyone else feel this is the problem or have further information on how to properly change the gloss alpha channel to black?

I’ve still made no progress on this. Any help is appreciated.

Find the leaf/branch material and change specular or gloss value to less. I do not own the pack so I cannot tell where the materials are, but they are usually in Materials folder somewhere in the pack folder.
OR just click the tree and it will show list of stuff attached to it, including materials.