The next time you build the current project, the alternative hex file will load on build complete.
Loading Debug Symbols During Program/Build
The checkbox to “Load symbols when programming or building for production (slows process)” allows you to load debug symbols when programming, as when using RTDM with DMCI, Motor Control applications, etc. Otherwise, the checkbox should be left unchecked to speed up programming and building (default).
If you need to work with Microchip Support staff directly, you can submit a technical support case. Keep in mind that many questions can be answered through our self-help resources, so this may not be your speediest option.