Android Question Using website as very simple database


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I would like to use a google sites website of mine to play host to some data. My app will need to upload and download data from the site. The data will be fairly minimal and I could repeatedly use the same file. Can someone point me in the right direction so that I can learn how to save a file to a website? I have found plenty of information on how to download files but not upload them. I am totally new to website programming.