I'm developing a file picker function in Google sheet, using Google Picker API. Now I'm able to show a custom dialog window to pick files from my Google drive, but the result doesn't fully meet my needs, I would like to debug and find out any wrong script in HTML which shows in the dialog window. However, when I right-click and select Inspect in a new popup window, it's grey and invalid, unable to debug. What's wrong? Does our company's Google manager restrict users to debug?
Here is a screenshot to show my problem: