We are using Drive Picker widget to select files in user's Drive.
The app is configured to run as user.
The app works properly when running at https://scripts.google.com/... URL; if we embed the app in a New Google Sites instance (google.com URL), the drive picker shows an empty, white dialog only.
We have some errors in Chrome's Console:
Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('https://docs.google.com') does not match the recipient window's origin [...]
Invalid 'X-Frame-Options' header encountered when loading [...] 'ALLOW-FROM https://script.google.com' is not a recognized directive. The header will be ignored.
Uncaught Error: Incorrect origin value. Please set it to - (window.location.protocol + '//' + window.location.host) of the top-most page at new JJ (13808338-picker_modularized_opc.js:975) at _createPicker (13808338-picker_modularized_opc.js:977) at HTMLDocument.
Firefox says
Load denied by X-Frame-Options: https://script.google.com/ does not permit framing by https://sites.google.com/s/[...]/edit?authuser=0.
We cannot find any clue about restrictions and limitations in Drive Picker's docs.
Thank you.
I run App Maker on my bare domain and have picker widget working.
pickerBuilder.setOrigin("https://example.com/");