[Plugin: NextGEN Gallery] folder and subfolder batch upload

sorry, im sure there was some descission about it, but i didnt find a working and updated solution, i have site with more the 50000 photos that is over more the 700 folders. when im trying to upload a folder throw import folder its not upload any photo at all only if its a folder with pictures directly inside, even when i trying to add each folder at time, after 20 folders i need to clean cookies and my firefox get stuck…

ive worked with many image galleries before and its kinda basic option, the nextgen is great gallery, but i still dont get it how this option and search option dont exist after so many years of working.

please help, im frustrated.