This happens if the file is not first in the selected files list.

Steps to reproduce:

1. Add 2 files for upload. The first one should be bigger so you have time do to the next steps.
2. Click the Upload button. The first starts to upload.
3. Delete the second file.

When the upload process gets to the second file, a NullReferenceException is thrown.

Implement a feature that allows the RadUpload control to resume its upload session when interrupted by a connection failure.

 The last response of contains incorrect information (it contains data from the previously uploaded chunk).

Available in LIB version: 2016.3.1010

Incorrect UI state when validating all files with the Validate event.
FIXED: If at least one file is valid the RadUpload behaves correctly.
TO BE FIXED: If all files are invalid the upload is in uploading state and should be in SelectFiles state ("Add more files" should be shown).

The RadUpload shoul handle this sceanrio without the help of the Dispatcher

The Upload does not pass data set in the args of its FileUploadStarting event. The values set in the args are send only for the first chunk, all chunks after that does not have that data.

Incorrect UI state when validating all files with the Validate event. 

Available in R2 2016 Release

Update documentation articles and add new ones.

Change the logic that creates a default unique name for duplicate files. At the moment it is based on a counter and instead we need to consider renaming the file as a "Copy of [fileName]" or "[fileName] - Copy".

Ability to upload files to Azure Blob Storage

CustomUploadHandler-AzureUpload demo is added in our SDK:
https://github.com/telerik/xaml-sdk/tree/master/Upload/CustomUploadHandler-AzureUpload 

Currently there is no way to pass parameters in the FileUploadFailedEventArgs of the FileUploadFailed event. In the UploadCompleted event such parameters are passed in the HandlerData.CustomData of the FileUploadedEventArgs.

Available in LIB version: 2014.3.1402

Change the StartUpload() method implementation so that it can work while the RadUpload control is disabled.

Expose an event to fire if the files that should be uploaded are in use by another process.

Dismissing all files doesn't change the title's status. However, if the "Cancel" button is used the title's status is updated correctly.

Set a Filter in the RadUpload. Click Browse Button. You cannot see the filtered files but you can select it in the combo with typing their names.

I find it a disconcerting that when the uploads have completed one is only offered the options to "Cancel" or "Add more files".  Clicking on "Cancel" seems like you are going to stop whatever you were doing which is not the case because "Cancel" only resets the session after the uploads have completed and you really can't cancel anything.  I would like to propose that the "Cancel" button switches to "Done" to give a clearer indication of what the options are.

If one adds more files or a session is in progress then it is appropriate for the "Cancel" to be visible.

If the user dismisses an item while the upload process is paused, the resume button is hidden and replaced by an Upload button. This way the upload process can be restarted but not resumed. But if there is only one item and it gets dismissed during paused upload operation - the resume button is still there.

We have RadUpload which has MaxFileSize limited to 10MB. If I only try to upload document everything works OK and the document is not uploaded. However, if I select the file which is open in editor, then close the editor and press upload, file is uploaded, even if size is bigger than 10MB

Steps to reproduce bug:
1. Open a file, which is bigger than max allowed size in editor (i.e. on MSWord)
2. Select the file in RadUpload - an exception is thrown to indicate the file is used by another process 
3. Close the editor
4. Press upload - the file is uploaded even though its size is bigger than the allows file size