[The Problem] I was under the impression that you once you "Import" samples from the SD card they are saved on to the internal memory of the ES2. I will import a sample from SD card put it into a pattern and write the pattern with the sample. When I turn off the ES2 sampler and turn it back on the sample is no longer on there and I have to re-import to the same spot. Furthermore I have been able to import a sample into a pattern, take the SD card out and it will play fine (as if it were saved onto internal memory) but even though i've written the patterns with the sample, upon turning it back on it's gone again...
[My Question] Shouldn't the samples be saved onto the ES2 after I import them from the SD card? Does the ES2 have internal memory to save to? Am I not saving my patterns correctly? Do I need to have the SD card in for it to play samples I want to import? Do I need to re-import the samples every time I turn it on?
I noticed that when I "export all samples" it will save a file (which takes a while to load upon turning it on) but will have the samples saved on it as a (.all) file, do I need to "Export all samples" every time I've made a change to my patterns so that they load up with my samples when I turn it back on? Do I need to export everything to a file which imports it all again?
Would really appreciate some help and insight from the forum. I have tried to figure this out from other posts but can't quite get a full answer from other's discussions. This has been very frustrating.

*Further details that might be useful, I deleted a bunch of the factory samples but have left on enough to mix in with ones I'd like to import*
*I am building one big set of patterns to play all together*