Why are my uploads and downloads being queued?
It's also worth noting that large files are split into parts based on the 'Multipart part size' on the 'Transfer settings' page, our app then uploads several parts of the file at a time based on the 'concurrent uploads', each part consumes one of the concurrent upload slots.
The default Digital Pigeon settings are relatively safe to cater for the average low grade internet connection. If you have a fast business grade connection make sure to head to the 'Transfer settings' page and use the 'Presets' drop-down button to select a config that matches your connection.