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First thing to do is create an album to put your images into. (user menu/My Albums)
Or you can just upload an attachment to any post.
Either should bring up your phone's file manager at some point to allow you to select an image to upload.
You should not have a problem uploading from a smartphone. If you do, please provide an error msg or description of what happened when you tried to upload (how far you got).
As a precaution you should make sure your phone's camera isn't recording EXIF info or GPS info.