In Simplicity Studio V4, it's now possible to flash a .hex file (or .omf file, for 8-bit MCUs) to a device from the Project Explorer. This removes the steps of having to open the flash programmer and manually navigating to the .hex file.
To perform this action, navigate to the .hex file in the project explorer. Right click on the file and then choose "Flash to Device" from the context menu. The flash programmer will be opened with the file path filled in with the path of the chosen hex file.