Upload to Relay Tower
The final objective is to take the Master Holotape to any Relay Tower and upload the data. From the Charleston Capitol Building the easiest Relay Tower to reach is probably Relay Tower HG-B7-09, located directly west of The Rusty Pick near the Charleston Fire Department. Head to the Relay Tower of your choosing, clear out any enemies defending it, then load the Master Holotape to the Emergency Management System Relay Terminal inside, then Initiate File Upload.
As usual, the quest ends with you needing to head back to Abbie’s Bunker and finalize your work using the terminal in the main room. Warp back, access her terminal, then Reboot the System to complete the quest.
Completion of this quest will automatically unlock the next quest, Defiance Has Fallen.