Is there a way to upload an article I wrote that is not currently online, to my profile?
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If you have it in hard copy you could scan it and upload that.
You do not say where the piece was written, but you could contact the group or publishing entity and ask if they have digitized, or plan to digitize their older material, or if they are able to email you a copy of what you wrote for them. If they are able to email it you could download and use that.
Good luck