Check this topic (Relevant posts #3, #5 and #6)
https://forums.sketchup.com/t/where-do-i-locate-my-materials-folder-in-mac/262918
Check this topic (Relevant posts #3, #5 and #6)
https://forums.sketchup.com/t/where-do-i-locate-my-materials-folder-in-mac/262918