Sa... but you can still view your pgn's here in addition to other apps. On chess.com, the only way that I'm aware of to view an external pgn, is to upload a game on the forums, or a blog. That way you can save it too.
PGN Viewer

There's also the analysis board on the live chess panel... you can paste a pgn on it. I've never tried it, so I'm not too sure about the 'save' feature.

Turns out you need to be a platinum or premium member to access it. Fortunately for you you're covered.

nah, it used to be downloadable ones, and not only pgn viewer, i see no other apps avaiilable such as analytical engines anywhere in chess.com, i feel like I am awake after many years. this explorer , i am aware of, but it needs me to be online while i use it.
Thanks for your input anyway!

@batgirl is right, @dc_razz. Let's walk through it step by step. Everything has changed on chess.com, but you'll still find those features.

That was very graphical one, thanks @batgirl , you really are a batgirl!! And thanks @WSama . They wanted to offload their space, it seems, so that they removed everything. I will find some external source.

I'm not sure if this is what you're looking for, but first we'll begin with the explorer:

This where you'll find explorer.

You'll be presented with a screen where you can paste your pgn:

You can paste your pgn in there. Unfortunately, you can't upload the pgn but have to copy and paste it. I use Google docs to open it, but first I have to change the file extension to file.txt

As soon as you paste your pgn, you're good to go:

The icon with the chess board is for stock fish / self analysis
The icon with the laptop is for the easier chess.com analysis tool:


Hopefully that's what you were looking for, there's also the live analysis board which might allow you to save your pgn into your game archives, but I'm not sure about that, I can't access that.
What happened with all the apps and explorer that chess.com used to have some years back?! I can find them nowhere?!