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Is there any method to let responder to upload multiple files in one block ?
I think there is no such option within Qualtrics. You will need to create multiple file upload questions for that. Please refer below link.
https://www.qualtrics.com/support/survey-platform/survey-module/editing-questions/question-types-guide/advanced/file-upload/
Else you can use custom scripting and upload files respective to response ID in your external database.
https://www.w3schools.com/tags/att_input_multiple.asp
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