Tap on the settings icon and on the Export tab to access the Export settings.
To export an PSD file as a single image set the Type as Image and the Format as PSD.
Use the slider under the preview to choose the image you wish to export.
The exported PSD file will contain a single image and will keep all the different layers composing this image.
To export a PSD file as a sequence, set the Type as Sequence and the Format as PSD.
This export allows you to export all your animation drawing sheets, sorted in each corresponding layer, in a PSD file.
The timing will not be kept for the import, and every drawing sheet will be exposed for 1 frame.
Tap on the Export button at the bottom to start the export.
Do not switch app during the export process.