When you click on the Files icon, you will see this:
You can click on the + to upload files:
You can add documents, pdfs, images:
All uploaded files will appear in the section below:
You can view, edit or copy link:
View the file:
Edit the name or description:
You can use the copy link option:
to add the file in the notes of any inquiry or topic:
The file will be linked to your note: