I believe you are looking for the following behaviour:
There is an easier way to do this as well, if you prefer to not manually fetch and merge in the subdirectory. If you run git submodule update --remote, Git will go into your submodules and fetch and update for you
Sourcetree does not currently support that functionality
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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