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OnSong be able t' display any manner o' file that iOS can show in th' built-in web viewer, savvy? We cannot guarantee th' usability o' these formats beyond that, matey. Fer instance, ye could import a Microsoft PowerPoint presentation which may view slides vertically. This may not be what ye be expectin', ye scallywag. Arrr, please use a supported file format fer better results or a text-based chord chart fer th' best plunder o' results.