While transferring 12 Gb file through the WD My Cloud software, transfer stops at 999 Mbs. nothing happens. But if I’m transferring the same file through the “finder” it takes a long time but it doesn’t stop the transfer at 999th mb of the file. macbook pro retina with El Capitan.
There are known issues with El Capitan and the 999mb file transfer failure. These issues have been discussed in numerous prior threads. One can use the forum search feature above to locate and read these earlier threads. For starters see the following two threads.