It’s easy to create a Local Content Library,
first step, go on menu -> content library
Click on create,

put the name and location and click next,

We stay on Local content library, and we click next

Select the datastore

Click finish

Now, we have our content created

To upload some OVA/OVF .. click on actions -> import item

Select files on your computer, and click import

As you can see, now we have our photon ova imported !

Next step, vSphere for Tanzu 😀