Windows client does not resume file transfer after interrupted download

Unfortunately not true. The average block size is 8MB. 100MB is the threshold to start a batch of upload, not to divide a block.

I don’t think letting the user choose the “block size” is a good idea. Most users don’t understand what this is. And making every client use different block size will cause unexpected conflict issue when syncing a library with existing folders.

There is no simple solution to this issue based on how the sync client works now. So my suggestion is to ask the user to pause automatic syncing when working on the move.

Another alternative is to use the SeaDrive client. It won’t automatically sync anything unless the user explicitly open a file.