How can I see the the submodules inside of my github repository?

Ive created one repo out of two small repos which are now submodules. In this Master Repo, I can change these submodules and commit them to a PR from the Master Repo, however in Github, I am unable to actually open the submodules in Github. They are hidden behind an unclickable file with the submodule repo # name and the folder icon has a little white arrow pointing right [see image]

This is the folder structure. Each submodule ofc has its own remote added pointing to the original repo that it came from.

Master Repo ->
  -submodule repo 1 
  -submodule repo 2

How can I get github to actually show the contents of these submodules in things like pull request reviews and such?

Solution

If I look at my own repository github.com/VonC/git-cred, my submodule batcolors @ 83bcef4 is clickable.

It is composed of:

an URL in the .gitmodules of my parent repository.
a gitlink (SHA1 recorded as a special entry in the index)

In your case, check if:

the submodule and its exact path are declared in your own .gitmodules file
if the associated URL is one GitHub can interpret.

How can I get GitHub to actually show the contents of these submodules in things like pull request reviews and such?

That is not supported with a submodule approach (reference to a sub-repository).

A subtree approach would:

preserve the Git history of the smaller repository before being "integrated" into the bigger one
show diffs during a pull request.