To import a PSD, in the Studio tap on Import and on Files, and then choose your PSD file.
To import a PSD in the shot, tap on the import button at the top of the layers pile and choose File. Then choose your PSD file.
After choosing the PSD file, you can choose between two types of import: vertically or horizontally.
Vertically: each layer will contain only one drawing sheet.
Horizontally: if the PSD is an animation, the corresponding images will be sorted in the timeline according to their layer group.
For example, in another software, if you have layers inside a layer group, the layers will be changed into drawing sheets and the layer group will become the layer.