There are a coupe different ways to transfer photo content from a computer to the iPhone. 

• Easiest is to use AirDrop from Apple device to Apple device. Here's how.

• Or use ICloud.com 

  1. Open ICloud.com on your mac
  2. Create an new album in the iCloud Photos app.
  3. Select photos & upload into that album from your Mac
  4. Connect to iCloud on your iPhone
  5. Open Recently, and select the album icon on the bottom navbar.
  6. That album, and the photos will be usable -
  7. Just tap Publish!
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