[Zubersoft]

Did you uncheck "Let MobileSheets Manage My Files"? I need to know if the file you are trying to write to is in the storage location or if it's in another location on the SD card. If you disabled that setting, then MobileSheetsPro will not have write access to the file and therefore can't modify it. I can explain this in further depth if that is the case.

Thanks,
Mike