No that’s not how it works. The A-P banks is the pattern banks of the sequencer for the currently active project.
You upload the samples to the +Drive. The +Drive can hold 1 gigabyte of samples. Then you load the sample(s) you want to use in your project to the project ram memory from the +Drive. The project ram can hold 128 samples and the total size of this memory is 68 megabyts (or something like that.) Then, on a track, for example the bd1, if you double-tap the “sample” page to assign a sample from the project ram to this track.
So the 128 kits you can have in a project all share the same project ram.
The learning curve on the Analog Rytm (and the Analog Four) is kind of steep but once you learn the workflow it’s great.