Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
What was the full and exact text of the error message when the upload failed?
I presume you are trying to upload, using these requisites:
1. a computer in good operating condition
2. a web browser that is fully updated, and has no extraneous or un-needed plugins activated on it
3. an internet connection of moderately high speed, at least, and good reliability and steadiness of performance.
Any clarification on those points might help me help you better. Let me know. Thanks.