How does the speaker upload the talks in indico?
If you have an account in indico ,please login and go to your talk. You will find the drop down arrow next to your talk. You can using "add materail" to upload your talks to indico.
If you haven't an account in indico or you fail to upload the talks by yourself, you can send your files to Shuopin Wen(firstname.lastname@example.org) or Tianhong Xing(email@example.com). They will help you to upload the files to indico.