sync files on all devices with iCloud

Sign in with same Apple ID and password on the same network between your Macs / iPad , you can follow the steps in the article Sync files from your Mac to your iPhone or iPad - Apple Support

Note : make sure iCloud Drive and desktops and documents is turned on in Macs Use iCloud Drive to store documents on your Mac and iOS devices - Apple Support

Read this article Keep your files up to date and share them with iCloud Drive - Apple Support

Hi Geneva2,

Welcome to Apple Support Communities. You can accomplish syncing files across your Apple devices using iCloud Drive. The guidance you need to get started is found in the Apple Support article: Set up iCloud Drive

On your iPhone, iPad, and iPod touch

1.Go to Settings > [your name].

2.Tap iCloud.

3.Turn on iCloud Drive.

On your Mac

1.Go to Apple menu  > System Settings or Apple menu  > System Preferences, then click Apple ID. 

2.Select iCloud.

3.Sign in with your Apple ID, if you need to.

4.Turn on iCloud Drive.

Feel free to reach back out if you have any questions.

We hope this helps you.