To easily check the trans fluid level requires a hoist and a diagnostic tool that can measure trans fluid temp. You run the car on the hoist until the fluid temp gets to 80C(?) and then remove the centre bolt (within the pan drain plug.) and if it’s at the correct level there should be a small stream of fluid coming out. If no fluid drains, it needs to be added until there is a small stream of fluid draining out…
The whole process is a PITA and these cars should have come with an engine bay fill tube and dip stick. Luckily there are two threads on these issues. One for changing trans fluid and filling correctly, another for installing a dip stick and filler tube to the trans, both in the VF forum section.