Newly created pattern does not appear in the swatch panel in any other file than its own
Hi! I'm new to illustrator and I can't seem to find an answer in any of the of the forums.
Here's how it is: I created a pattern (Object > Pattern > Make) successfully saved as pattern to swatch panel. Great.
Except, when I open up a new file to practice using the pattern, it's not in the swatch panel. I checked the settings and it said it was showing everything.
I go back to the original file that I used to make the pattern. According to the swatch panel, it is a pattern. Going from each file and the contents of the swatch panel changes. I can't figure out how to keep the pattern there. What's the point of creating a pattern if I can't put it on anything else.
If anyone has encountered this before, please help me.

