You can copy one file from one folder to another in Syncplicity. To do this, go to the file you wish to copy. Tap the context menu for that file then tap Copy. You may need to swipe the context menu to the left to see Copy.
Go to the folder where you wish to place the copied file. You must be the owner or have editor permission. Once there, you see the icons at the top of the screen as shown below.
If you wish to create a new folder, click the folder + icon. Click the copy icon () to paste the file.