To upload a presentation, you must be a presenter. As the presenter, you have a blue button with a plus in the lower left corner. The presenter actions can be called up using this button. To upload a presentation, click the "Upload presentation" option. The presentation can be uploaded via drag and drop or via your file explorer. OpenDocument, Microsoft Office and .pdf files are accepted. Uploading .pdf files is recommended. Errors may occur when converting other file formats.