Deductions & credits

As you go along you should always save the .taxfile to a separate removable storage unit like a thumb drive to avoid such issues as these ... also always back up the finished filed return  to more than one thumb drive for safekeeping.   Storage to a cloud is not good enough and you cannot work with a file in the cloud ... so if you have one bring/copy it back to the hard drive so the TT program can find it.