In Xamarin ( UWP ) Pdfdtron Unable to delete pdf file - pdftron

Normally I am able to delete the pdf file, after viewing it by using PDFViewCntrl. But I am unable to delete the pdf file when I draw some annotaions on the pdf file using annotation tool.
I dispose tool manager, pdfviewCntrl and Pdfdoc, it works nicely for both ios and android. But the problem is only in UWP.
During the time of deletions it shows that "The process cannot access the file".

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Also, if I'm unable to get data streamer on my version (I'm using the student version of MS Office), what are the alternatives?
I wish to connect my Arduino Uno to Excel.
This is my current add-ins list
Edit 1: I downloaded the Data Streamer from https://www.microsoft.com/en-us/download/details.aspx?id=56976
And added the setup.exe file to com add-ins which downloaded the file unfortunately, it still isn't coming in the list.
Please view the following images to get an idea of the error.
As you can see, it downloaded successfully
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Thanks!

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The allitems.aspx (the standard view) doesn't show correct icon for PDF and other files. Why is it so?
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