Importing Save Data using USB Flash Drive or External Hard Drive (PS+ not required).

Part 1: On Your PS4

• Connect a USB flash drive or external hard drive to your PS4
  • Recommended for storage devices to be formatted to FAT or exFAT, but not as USB extended storage. Not all devices may work.
• Go to Settings
• Select Application Saved Data Management
• Select Saved Data in System Storage
• Select Copy to USB Storage Device
• Select Uncharted 4: A Thief’s End or Uncharted: The Lost Legacy 
• Select the Save Data you wish to copy
• Confirm the upload

Official Sony Resource for using USB Storage Devices on PS4: https://www.playstation.com/en-us/support/hardware/ps4-manage-storage-space/ 

Part 2: On Your PS5

• Go to Settings
• Select Saved Data and Game/App Settings
• Select Saved Data (PS4)
• Select USB Drive
• Select Copy to Console Storage 
• Select Uncharted 4: A Thief’s End and/or Uncharted: Lost Legacy under the Copy to Console Storage option
  • Selecting a title will download all Save Data you imported for that game during Part 1.
• Select Copy to confirm the process

Official Sony Resource for Data Management features on PS5: https://www.playstation.com/en-us/support/hardware/ps5-manage-storage-space/  

Part 3: On Uncharted: Legacy of Thieves Collection

• Select the title you wish to play
• Select Story
• Select Import Game from PS4 Console
• Select the Save Data you wish to use for import
• Enjoy the game!