Can I keep the file transfer running when the App is closed?

[comcsoft]

When iTransfer is closed or put into background, the ongoing file transfer will be stopped automatically. This is due to iOS restrictions. This applies when you take a phone call on your iPhone or open up a third party App from iTransfer.

The unfinished transfer will be shown as failed status. You can resume or restart the file transfer by tapping on the buttons on the right side of the row.