What kind of text format file is it. ? If it's in the form of a PDF document format file, you can upload it quickly and easily to the following site, that will produce a link to the uploaded document, you can then post that link and your document can be read online by your readers, and it can also be downloaded and saved for offline viewing by them if they wish to. No need for the poster or the reader, to sign up, log in, or use an email address or anything like that.
https://www.docdroid.net/ For example...
http://docdro.id/z5VW2vDIf your document isn't already in PDF document file format, there are similar facilities available for use with other document tile formats, and also there are facilities for converting those document file formats to PDF format.