Outlier offers you two methods for submitting your written assignments: either via the native text-field or by uploading a file (acceptable file types are .doc, .docx, .rtf, .txt, .pdf, and .odt). Both methods are acceptable. Please note that Outlier's native text-field does not offer the same text-formatting functionality that you would find within word processing applications like Microsoft Word or Google Docs.
For more information about formatting within Outlier’s native text-field, please refer to: Outlier’s Native Text-Field does not have text-formatting controls. How can I submit my written work in APA Format without this functionality?