I already answered your support ticket on the subject. For convenience I will paste my answer here as well.
Straight to your questions:
- This problem might occur if the application is not configured to allow uploading of large files. Please check the following help article:
Uploading Large Files
- I am not quite sure I understand what exactly you are trying to achieve. If you want to select multiple files and download them, I believe this KB article will be of help solving this case.
- You can manipulate the uploaded file by handling the RadFileExplorer's ItemCommand server-side event and get reference to the file, e.g.:
sender, Telerik.Web.UI.RadFileExplorerEventArgs e)
//add custom code here
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