Move files in Air Explorer is very easy and you have some ways to do it.

One of them is dragging files, other is copy and paste files and the third is using the arrows. In this way, select the files or folders and and click in the arrow.

You can copy&paste in both directions.

You can check more information here:
-Transfer files from Mega to other clouds
-How to transfer files from Onedrive to Google Drive?
-Migrate from OneDrive to Mega with Air Explorer
-Transfers speed between clouds in Air Explorer