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I've copied all my save files from my previous installation of fceux and pasted it to the sav folder after installing the new one but none of them seem to show up. How would I go about applying them? I've made sure to delete the previous fceux opk file as well as the .fceux folder entirely before installing the newer version

Is there no one that can answer this?  Does this mean no save states can be used when there's a new release?

New versions of emulators often don't have interchangeable savestates. In the release notes of FCEUX 2.2.3 it says:

Fixed vrc7 sound savestates

So I think this and perhaps also other modifications have affected savestates.

Usually it's best to make a normal save before switching to a newer version of an emulator as there is always a high probability that savestates are affected in new releases.

Thank you very much Aeter. I didn't realize there was a normal save? How is a normal save performed? Topically I'd hit the L button and go to save states. Didn't notice an alternative?

With normal saves I mean saving in game, but for NES of course there aren't that many that have this ability. Quite a few use a password system though.

Probably somewhere in /media/data/local/home/.fceux/

That's the only saves available.

Is it something else? If so, which files and where? Thank you

There are no other sav files, unfortunately.

So, to be clear, there is no way to save the normal save? There's no way to use a normal save from one version of the same emu to another?

If you have a regular save file from a game, you should be able to use it with different emulator versions.

The problem is that most NES games don't have save functionality, so no save files.

Also a save state is not the same as a save file. Save files are generated inside the game itself to keep your progress, when you hit the save button or similar.

A save state is created by the emulator in the emulator menu, this stores the exact state of the game. These often aren't compatible with other versions of the emulator, depending on what has changed between versions.

Didn't realize when you save in game (like in dbz2), it alters the rom itself. I'll give this a try on the next release. Thanks!!

It doesn't alter the rom, lol. The "in-game" save should be saved in a ".sav" format.
It generally works across emulators.

In contrast, save states are generally specific to each NES emulator.
In your case tho, it seems like it is a file naming issue. Care to share them ?

SAV is the normal save game file. I think save state files have FCS extension.