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Use the 'Import Folder' option to add a collection of songs to your song catalog. Song One examines all PDF and text files in the selected folder (including its subfolders) and imports them.
To import a folder tap/click on the inward pointing arrow in the upper left corner of Song One's main window. (If the library panel is not visible tap/click on the three lines in the upper left corner of the screen.)
Choose 'Import Folder' in the pop-up menu and select the folder containing your songs.