@granada29 thanks for your reply. My OS dirve is on NVMe. I'm moving files from NVMe to internal HDD. My Initial question is still the same, like every function in any OS needs some memory to perform its jobs. so why we don't have control over the memory size for the copy/move function? like we control while installing other software.

I observed below things with my “renamefiles” custom shortcuts. Some time it may take more than 1500 files at once. If first execution is failed, it always fails even for 10 files. After reboot it work fine. Some time it process 7 and 10 files simultaneously. If we select more file like 2k it process 1 file at a time. Did anyone seen this or any explanations will be appreciated.