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Re-update upload file when refresh page

Hello everyone. I am a newbie for dash plotly. I am working on a project and following the tutorial on the page https://dash.plot.ly/.
The problem that I met is in the upload component, dash does not allow get full path file from client, it just have file name. It means when you click button to upload a file, the dcc upload just have file name without full path. I want to create a REFRESH button so that when I click this button, the file will be upload again without click UPLOAD button and navigate to file.
So what should I do?
I’ve searched google for a long time and met no answer, so can you give some ways to solve this problem.
Thank you so much!