See this and that
To add to Github LFS
git lfs track "*.mmap"
.gitattributes file is
*.tif filter=lfs diff=lfs merge=lfs -text
*.zip filter=lfs diff=lfs merge=lfs -text
*.mmap filter=lfs diff=lfs merge=lfs -text
List all files in local git
git ls-tree --full-tree -r --name-only HEAD