Hi @lcwong26,
Thank you for joining the community! If files are needed in a dispute, they will be requested and an upload option will appear in the Resolution Center for that particular case. The upload feature is not present if the process isn't calling for additional evidence. If evidence was requested and the feature is not there, you can contact customer service for more options.
To contact customer service, please click Contact at the bottom of the PayPal website for available options, or reach out by PM on Facebook or DM on Twitter.
I hope this helps!
Olivia
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