Perfect tempo can import songs stored on Dropbox and other cloud services that are compatible with the iOS Files app.
First, make sure you have the official Dropbox app installed and can access your Dropbox files using the iOS Files app.
In Perfect Tempo, tap the ‘Files’ item on the front screen. This will open the Files area. Tap the ‘Import File’ button which will open a standard file picker. Navigate to the Dropbox folder where your songs are stored. Tap ‘Select’ at the top of the screen and select the file or files you wish to import (or Tap ‘Select All’ if you want to import all the files from the folder). Now tap ‘Open’. The files will be imported into Perfect Tempo.