I never heard of this kind of error. I am wondering if you're using a special character in your password that we never tested before. Could you try changing to password to simply letters and numbers and try again? Try using Latin characters only with no diacritics such as accents or "eñes"...
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I had the same problem. I signed up today and had an 8 character password, 7 letters and 1 number. 1 of the letters capitalized and the rest lower case. I was getting the invalid user error when i shared, but i was using the same username/password to successfully log into the website.
i changed the password to 10 character password, 1 number and 9 letters, but did not use any capitalization and it uploaded!
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