find all files larger than 1MB and output their file extensions
find . -type f -size +1M -exec sh -c 'echo "${1##*.}"' _ {} \; | sort | uniq -c
track these extensions in git lfs
git lfs track "*.bmp" "*.cubemap" "*.dae" "*.fbx" "*.glb" "*.jpg" "*.mp4" "*.png" "*.psd" "*.tga" "*.tif" "*.unity" "*.wav"