1) Install Fiddler from https://www.telerik.com/download/fiddler.

2) Run Fiddler. 

Note: IF you use HTTPS, Go to Tools > Options > HTTPS > ensure that the Decrypt HTTPS traffic option is checked.

3) Go to Fiddler and make sure that menu item "Capture Traffic" in "File" menu is checked.

4) Make desired actions with the web part.

5) Go to Fiddler menu "File" \ "Save"\ "All Sessions" choose format "Session Archive (.saz)" and send us saved file.