I have fairly large quantities of data, some in .mat and some in .xlsx. I can cut-and-paste from PC hard drive to MATLAB workspace on desktop. I haven't found any way to do the same thing with MATLAB Online. Same problem with reversing the process - i.e. cut-and-paste from workspace to PC. I tried online Documentation - usually no information at all. I tired workspace help with same results. Surely this must be a common and routine necessity to MZTLAB users.