Hi Arun,
There can be a minor chance that the size of the other files are greater than the size set to MaxFileSize property. Please have a look at the following code I tried to upload multiple files which works fine at my end.
ASPX:
C#:
Also Telerik recommends to set the ChunkSize property with a value more that 3000 because when it is less than 3000 the uploading progress may not work correctly.
Thanks,
Shinu.