Today I tried to import a larger amount of photos (exactly 3392 42MP RAW's) but Lightrom 6.10.1 is not able to handle that. The program does no longer respond and has to be terminated. I re-tried several times; but each time the same problem: Lightroom cannot handle that situation. I then tried with smaller amounts (like 500 photos) which could be imported correctly. I then had to copy several smaller portions (with about 500 photos) into my folder and do a synchronize (this worked fine).