If I want to copy several files from the host to the guest, I figured I would select the set and then drag them all at once. It turns out that doesn't work. A sheet drops down to show the copy progress and the progress bar seems to correctly drag for the total operation, but something goes wrong once the files are inside the VM. When the first file finishes, an error dialog pops up in the Windows guest saying the file couldn't be moved. The error dialog in the guest is unresponsive until the total copy finishes. When it is done, there is actually a stack of error dialog in the guest, once for each file copied. The files do not appear in the location I dropped them, but I have not checked to see that they aren't still laying in the DnD temp folder.
I tried another approach, drop each file individually, but don't wait for each one to finish. This actually works, though the progress display is a little messed up. In this case, a queue should probably be created and displayed in some fashion on the progress sheet. The observed behavior is the progress bar rapidly jumps between the correct position for each of the files being simultaneously copied. When the progress sheet vanishes, all the files are in the location I dragged them to, so this approach technically works but could use some polish. Hopefully, the first issue will be corrected so this isn't necessary, but this case could still come up when copying sets of files from various locations such that a single drop operation can't be used for all files at once.
