projects can be exported to onedrive as .jpg, .png, .psd, or .psdx files through the export > share options if you have the onedrive app installed.
files can be exported to your internal storage as .jpg or .ong.
.jpg, .psd, and .png files from photoshop touch can be imported into the desktop version using the regular "open file" dialog.
however i recommend you make use of the creative cloud.
this allows you to export/import .psdx files through your adobe account without having to manually transfer files.