Torque converter?

Just tell them you replaced the CVT and need the replacement coded to match the vehicle.

You're welcome. Please let us know the outcome.

There will always be some in the transmission and the cooler that doesn't drain out. To fill it you add some fluid, then run it to warm it up, then check the fluid level at the correct temperature.

In total it holds about 8 quarts of fluid for that car. Some hold far more. The reason to check it while it is running is so that you get a reading of the level while it is in use and most of the fluid is in the working parts of the transmission. If you check it with it shut off it will read high because all of the fluid in the passages, converter and systems drains back into the pan. If you filled it cold as soon as you start it and the pump pulls in the fluid it's very possible that it would not have enough fluid. In a transmission the fluid does a lot, it gets pressurized to operate the parts but it also lubricates the bearings and bushings and it also acts as a coolant.
Start it and run it through the gears, now with it idling check the level. Pull the stick, wipe it off and put it back. Check it. If it's to high remove some (being new fluid you could use an extractor that is clean and save the fluid).

Yes you could re-use it as long as it's clean.

It can be a bear if it's overfilled. The fluid can get foamy and cause damage. Attached is the check procedure.

Park or neutral with the wheels blocked. The idea is that you run it to warm it up and circulate the fluids, so the various parts are filled. Then with it in park or neutral with the engine running the various parts are filled and the pan should only have the remainder and be full at the operating temperature. When the engine is then shut off and the fluid all drains out of components that are higher than the pan you would read it as overfilled. But the second you start the engine back up the fluid goes back into circulation and would now read as full again. It's intended to keep the transmission and cooler lines filled while in operation.

We try to keep the issues separated to make searching easier so could you ask this as a new question? However I would suggest having a shop run a system test on the vehicle. The analyzers used these days can help pinpoint the problem.

Good to hear you found the issue. Not the first time someone got a bad "new part" Like quite a few of us say these days, "Just because it's new, doesn't mean it any good". I had a local parts store test 4 alternators right off their shelves and 1 was bad and 1 was marginal. Brand new parts. Have had counterfeit parts, parts with the wrong stamps on them and more. That is why I try to use only OE, and will go to a salvage yard to get a used OE part if the only available ones are aftermarket. Spend 8 hours tearing out a dash panel to get to a 20 dollar part, put it back together and a month later that new part fails and see how often you want to use those parts.

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